Add Xamarin Forms Sample

Author: kazo0

samples/MvvmSampleUwp/MvvmSampleUwp/Assets/docs/AsyncRelayCommand.md renamed to samples/MvvmSample.Core/Docs/AsyncRelayCommand.md

@@ -6,7 +6,7 @@
 using System.Linq;
 using System.Text.RegularExpressions;
 
-namespace MvvmSampleUwp.Helpers
+namespace MvvmSample.Core.Helpers
 {
     /// <summary>
     /// A simple class to help with basic operations on markdown documents.
@@ -21,7 +21,8 @@ public static class MarkdownHelper
         public static IReadOnlyDictionary<string, string> GetParagraphs(string text)
         {
             return
-                Regex.Matches(text, @"(?<=\W)#+ ([^\n]+).+?(?=\W#|$)", RegexOptions.Singleline)
+               Regex.Matches(text, @"(?<=\W)#+ ([^\n]+).+?(?=\W#|$)", RegexOptions.Singleline)
+               .OfType<Match>()
                 .ToDictionary(
                     m => m.Groups[1].Value.Trim().Replace("&lt;", "<"),
                     m => m.Groups[0].Value.Trim().Replace("&lt;", "<").Replace("[!WARNING]", "**WARNING:**").Replace("[!NOTE]", "**NOTE:**"));

samples/MvvmSampleUwp/MvvmSampleUwp/Assets/docs/Introduction.md renamed to samples/MvvmSample.Core/Docs/Introduction.md

@@ -6,7 +6,7 @@
 using System.Linq;
 using Newtonsoft.Json;
 
-namespace MvvmSampleUwp.Models
+namespace MvvmSample.Core.Models
 {
     /// <summary>
     /// A class for a query for posts in a given subreddit.
@@ -69,7 +69,7 @@ public class Post
         /// Normally, not all posts have a self text post available.
         /// </remarks>
         [JsonIgnore]
-        public string SelfText { get; } = string.Join(' ', Enumerable.Repeat(
+        public string SelfText { get; } = string.Join(" ", Enumerable.Repeat(
 @"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
 Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
 Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.