Add github workflows

.github/workflows/build.yml

@@ -0,0 +1,35 @@
+name: Build and Test
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Set up CMake
+      uses: lukka/get-cmake@v3
+
+    - name: Install dependencies
+      run: sudo apt-get install -y cmake g++ libgtest-dev
+
+    - name: Build project
+      run: |
+        mkdir build
+        cd build
+        cmake -DCMAKE_BUILD_TYPE=Debug ..
+        make
+
+    - name: Run tests
+      run: |
+        cd build
+        ctest --output-on-failure