Added a github action

Author: JakeSays

.github/workflows/build.yml

@@ -0,0 +1,42 @@
+name: Build
+
+on:
+  push:
+    branches: [main]
+    tags: ['v*']
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-latest
+            rid: linux-x64
+            artifact: ClaudeUsageMonitor-linux-x64
+          - os: windows-latest
+            rid: win-x64
+            artifact: ClaudeUsageMonitor-win-x64
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '10.0.x'
+
+      - name: Publish (AOT)
+        run: dotnet publish ClaudeUsageMonitor.csproj -c Release -r ${{ matrix.rid }} -o publish/${{ matrix.rid }}
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.artifact }}
+          path: publish/${{ matrix.rid }}
+          if-no-files-found: error