Create workflows

.github/workflows

@@ -0,0 +1,25 @@
+name: Build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    
+    steps:
+    - uses: actions/checkout@v2
+    
+    - name: Configure CMake
+      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=Release
+
+    - name: Build
+      run: cmake --build ${{github.workspace}}/build --config Release
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v2
+      with:
+        name: gravity-simulator-${{ matrix.os }}
+        path: ${{github.workspace}}/build/GravitySimulator  # Adjust this path