Run tests with GitHub Actions (#1)

.github/workflows/c-cpp.yml

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

Readme.md

@@ -1,5 +1,7 @@
 <p align=center><img src=https://github.com/samsonjs/lake/raw/main/lake.jpg width=640 height=428 alt="Shawnigan Lake"></p>
 
+![example workflow](https://github.com/samsonjs/lake/actions/workflows/c-cpp.yml/badge.svg)
+
 Lake Scheme
 ===========