Add basic GitHub actions build (#14)

.github/workflows/go.yml

@@ -0,0 +1,25 @@
+name: build
+on: [push, pull_request]
+jobs:
+
+  build:
+    name: Build and Test
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Set up Go 1.20
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.20.1
+      id: go
+
+    - name: Check out code 
+      uses: actions/checkout@v2
+
+    - name: Get dependencies
+      run: |
+            go mod download
+
+    - name: Build
+      run: |
+            go build ./...