Add CI

Author: ethomson

.github/workflows/main.yml

@@ -0,0 +1,29 @@
+name: CI Build
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        platform:
+        - ubuntu-latest
+        - macos-latest
+        - windows-latest
+    
+    runs-on: ${{ matrix.platform }}
+
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@v3
+    - name: Build
+      run: |
+        mkdir build
+        cd build
+        cmake ..
+        cmake --build .