add GitHub Action

.github/workflows/main.yml

@@ -0,0 +1,38 @@
+name: Test
+on:
+  pull_request:
+  push:
+    branches:
+    - master
+    tags:
+    - v*
+jobs:
+  test:
+    strategy:
+      matrix:
+        go-version:
+        - 1.14.x
+        - 1.15.x
+        os:
+        - macos-latest
+        - ubuntu-latest
+        - windows-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Set up Go
+      uses: actions/setup-go@v1
+      with:
+        go-version: ${{ matrix.go-version }}
+    - name: Cache Go modules
+      uses: actions/cache@v1
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Build
+      run: go build ./...
+    - name: Test
+      run: go test ./...