Create build and test action for windfish (#1)

Author: featherless

.github/workflows/windfish.yml

@@ -0,0 +1,19 @@
+name: Windfish
+
+on:
+  push:
+    branches: [ develop ]
+  pull_request:
+    branches: [ develop ]
+
+jobs:
+  build:
+
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build
+      run: cd lib; swift build -v
+    - name: Run tests
+      run: cd lib; swift test -v