Added GitHub action for building & running tests

.github/workflows/build.yml

@@ -0,0 +1,30 @@
+name: build
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+
+  build:
+    name: Build & Test
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Set up Go 1.x
+      uses: actions/setup-go@v2
+      with:
+        go-version: ^1.17
+
+    - name: Check out code
+      uses: actions/checkout@v2
+
+    - name: Download module dependencies
+      env: 
+         GOPROXY: "https://proxy.golang.org"
+      run: go mod download
+
+    - name: Test
+      run: go test -v -coverprofile=coverage.txt ./...