Add github workflow for building

Author: rigtorp

.github/workflows/ccpp.yml

@@ -0,0 +1,49 @@
+name: C/C++ CI
+
+on: [push]
+
+jobs:
+  build-ubuntu:
+
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v1
+    - name: Build & Test
+      run: |
+        cmake -E remove_directory build
+        cmake -B build -S . -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_FLAGS="-Werror -O2 -fsanitize=address,undefined"
+        cmake --build build
+        cd build
+        ctest --output-on-failure
+        
+  build-windows:
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [windows-latest, windows-2016]
+    
+    steps:
+    - uses: actions/checkout@v1
+    - name: Build & Test
+      run: | 
+        cmake -E remove_directory build
+        cmake -B build -S .
+        cmake --build build --config Debug
+        cd build
+        ctest --output-on-failure
+
+  build-macos:
+
+    runs-on: macOS-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Build & Test
+      run: |
+        cmake -E remove_directory build
+        cmake -B build -S . -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_FLAGS="-Werror -O2 -fsanitize=address,undefined"
+        cmake --build build
+        cd build
+        ctest --output-on-failure