Add GitHub workflow

.github/workflows/go.yml

@@ -0,0 +1,26 @@
+name: build
+on: [push, pull_request]
+jobs:
+  test:
+    strategy:
+      matrix:
+        go-version: [1.11.x, 1.12.x, 1.13.x]
+        platform: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.platform }}
+    env:
+      GO111MODULE: "on"
+    steps:
+
+    - name: Install Go
+      uses: actions/setup-go@v1
+      with:
+        go-version: ${{ matrix.go-version }}
+
+    - name: Checkout code
+      uses: actions/checkout@v1
+
+    - name: Download Go modules
+      run: go mod download
+
+    - name: Build
+      run: go build -v ./...