Update project structure and enhance documentation

- Updated `.gitignore` to include additional files and tools.
- Added `CONTRIBUTING.md` for contribution guidelines and code of conduct.
- Enhanced `README.md` with project details, usage, and performance metrics.
- Introduced `ci.yaml` for GitHub Actions CI setup.
- Modified `Program.cs` to demonstrate `IPFilter` usage.
- Created `Samples.csproj` for sample applications.
- Updated solution file to include new projects.
- Targeted .NET 9.0 in `Arad.TrieNet.csproj` with metadata.
- Added `DenyEntry.cs` for deny list structure.
- Significantly improved functionality in `IPFilter.cs`.
- Added `Node.cs` for Trie structure representation.
- Created `Arad.TrieNet.Tests.csproj` for unit testing.
- Implemented unit tests in `IPFilterTest.cs`.
- Modified `Program.cs` to include a "Hello World" message.

Author: ammarheidari

.github/workflows/ci.yaml

@@ -0,0 +1,24 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: 9.0.x
+    - name: Restore dependencies
+      run: dotnet restore
+    - name: Build
+      run: dotnet build --no-restore
+    - name: Test
+      run: dotnet test --no-build --verbosity normal