Add GitHub action to build PhysisSharp

.github/workflows/main.yml

@@ -0,0 +1,28 @@
+name: Main
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: windows-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+      with:
+        submodules: 'yes'
+
+    - name: Install .NET Core
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: 8.0.x
+
+    - name: Setup MSBuild.exe
+      uses: microsoft/setup-msbuild@v2
+
+    - name: Build
+      run: dotnet build