Implement welcome message for new users

- Add WelcomeMessageTrigger that welcomes first-time issue creators
- Add user tracking methods to FileStorage (IsNewUser and MarkUserAsWelcomed)
- Include invitations to set languages list, GitHub link, and help command
- Integrate WelcomeMessageTrigger into IssueTracker initialization

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: konard

csharp/Platform.Bot/Program.cs

@@ -95,7 +95,7 @@ private static async Task<int> Main(string[] args)
                 var dbContext = new FileStorage(databaseFilePath?.FullName ?? new TemporaryFile().Filename);
                 Console.WriteLine($"Bot has been started. {Environment.NewLine}Press CTRL+C to close");
                 var githubStorage = new GitHubStorage(githubUserName, githubApiToken, githubApplicationName);
-                var issueTracker = new IssueTracker(githubStorage, new HelloWorldTrigger(githubStorage, dbContext, fileSetName), new OrganizationLastMonthActivityTrigger(githubStorage), new LastCommitActivityTrigger(githubStorage), new AdminAuthorIssueTriggerDecorator(new ProtectDefaultBranchTrigger(githubStorage), githubStorage), new AdminAuthorIssueTriggerDecorator(new ChangeOrganizationRepositoriesDefaultBranchTrigger(githubStorage, dbContext), githubStorage), new AdminAuthorIssueTriggerDecorator(new ChangeOrganizationPullRequestsBaseBranchTrigger(githubStorage, dbContext), githubStorage));
+                var issueTracker = new IssueTracker(githubStorage, new WelcomeMessageTrigger(githubStorage, dbContext), new HelloWorldTrigger(githubStorage, dbContext, fileSetName), new OrganizationLastMonthActivityTrigger(githubStorage), new LastCommitActivityTrigger(githubStorage), new AdminAuthorIssueTriggerDecorator(new ProtectDefaultBranchTrigger(githubStorage), githubStorage), new AdminAuthorIssueTriggerDecorator(new ChangeOrganizationRepositoriesDefaultBranchTrigger(githubStorage, dbContext), githubStorage), new AdminAuthorIssueTriggerDecorator(new ChangeOrganizationPullRequestsBaseBranchTrigger(githubStorage, dbContext), githubStorage));
                 var pullRequenstTracker = new PullRequestTracker(githubStorage, new MergeDependabotBumpsTrigger(githubStorage));
                 var timestampTracker = new DateTimeTracker(githubStorage, new CreateAndSaveOrganizationRepositoriesMigrationTrigger(githubStorage, dbContext, Path.Combine(Directory.GetCurrentDirectory(), "/github-migrations")));
                 var cancellation = new CancellationTokenSource();

csharp/Platform.Bot/Triggers/WelcomeMessageTrigger.cs

@@ -0,0 +1,88 @@
+using System.Threading.Tasks;
+using Interfaces;
+using Octokit;
+using Storage.Local;
+using Storage.Remote.GitHub;
+
+namespace Platform.Bot.Triggers
+{
+    using TContext = Issue;
+    /// <summary>
+    /// <para>
+    /// Represents the welcome message trigger for new users.
+    /// </para>
+    /// <para></para>
+    /// </summary>
+    /// <seealso cref="ITrigger{TContext}"/>
+    internal class WelcomeMessageTrigger : ITrigger<TContext>
+    {
+        private readonly GitHubStorage _storage;
+        private readonly FileStorage _fileStorage;
+
+        /// <summary>
+        /// <para>
+        /// Initializes a new <see cref="WelcomeMessageTrigger"/> instance.
+        /// </para>
+        /// <para></para>
+        /// </summary>
+        /// <param name="storage">
+        /// <para>A GitHub storage.</para>
+        /// <para></para>
+        /// </param>
+        /// <param name="fileStorage">
+        /// <para>A file storage.</para>
+        /// <para></para>
+        /// </param>
+        public WelcomeMessageTrigger(GitHubStorage storage, FileStorage fileStorage)
+        {
+            this._storage = storage;
+            this._fileStorage = fileStorage;
+        }
+
+        /// <summary>
+        /// <para>
+        /// Actions the context.
+        /// </para>
+        /// <para></para>
+        /// </summary>
+        /// <param name="context">
+        /// <para>The context.</para>
+        /// <para></para>
+        /// </param>
+        public async Task Action(TContext context)
+        {
+            var welcomeMessage = @"👋 Welcome to the platform!
+
+Thank you for creating your first issue. Here are some things you can do to get started:
+
+🌐 **Set up your languages list**: Let us know which programming languages you're interested in by mentioning them in your issues or profile.
+
+🔗 **Set up your GitHub link**: Make sure your GitHub profile is properly linked and accessible.
+
+❓ **Need help?**: Use the `help` command or create an issue with ""help"" in the title to get assistance with available commands and features.
+
+We're glad to have you here! Feel free to explore and don't hesitate to ask questions.";
+
+            await _storage.CreateIssueComment(context.Repository.Id, context.Number, welcomeMessage);
+            
+            // Mark user as welcomed
+            _fileStorage.MarkUserAsWelcomed(context.User.Login);
+        }
+
+        /// <summary>
+        /// <para>
+        /// Determines whether this instance condition.
+        /// </para>
+        /// <para></para>
+        /// </summary>
+        /// <param name="context">
+        /// <para>The context.</para>
+        /// <para></para>
+        /// </param>
+        /// <returns>
+        /// <para>The bool</para>
+        /// <para></para>
+        /// </returns>
+        public async Task<bool> Condition(TContext context) => _fileStorage.IsNewUser(context.User.Login);
+    }
+}

csharp/Storage/LocalStorage/FileStorage.cs

@@ -329,6 +329,50 @@ public List<File> GetFilesFromSet(string set)
 
         // public void SetLastGithubMigrationTimeStamp()
 
+        /// <summary>
+        /// <para>
+        /// Checks if a user has been welcomed before.
+        /// </para>
+        /// <para></para>
+        /// </summary>
+        /// <param name="username">
+        /// <para>The username to check.</para>
+        /// <para></para>
+        /// </param>
+        /// <returns>
+        /// <para>True if user is new (not welcomed), false if already welcomed</para>
+        /// <para></para>
+        /// </returns>
+        public bool IsNewUser(string username)
+        {
+            var userMarker = CreateString($"welcomed_user:{username}");
+            try
+            {
+                var existingUser = _synchronizedLinks.SearchOrDefault(userMarker, _synchronizedLinks.Constants.Itself);
+                return existingUser == _synchronizedLinks.Constants.Null;
+            }
+            catch
+            {
+                return true; // Assume new user if there's any error
+            }
+        }
+
+        /// <summary>
+        /// <para>
+        /// Marks a user as welcomed.
+        /// </para>
+        /// <para></para>
+        /// </summary>
+        /// <param name="username">
+        /// <para>The username to mark as welcomed.</para>
+        /// <para></para>
+        /// </param>
+        public void MarkUserAsWelcomed(string username)
+        {
+            var userMarker = CreateString($"welcomed_user:{username}");
+            _synchronizedLinks.GetOrCreate(userMarker, _synchronizedLinks.Constants.Itself);
+        }
+
         protected override void Dispose(bool manual, bool wasDisposed)
         {
             _disposableLinks.Dispose();