added github workflow for tests

.github/workflows/c-cpp.yml

@@ -0,0 +1,19 @@
+name: C/C++ CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: make test
+      run: make test
+    - name: run tests
+      run: ./test