added test workflow

Author: Code-Hex

.github/workflows/test.yml

@@ -0,0 +1,23 @@
+name: test
+on:
+  push:
+    branches:
+    - "main"
+  pull_request: {}
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+        - ubuntu-latest
+        - macOS-latest
+        - windows-latest
+    steps:
+    - name: checkout
+      uses: actions/checkout@v2
+    - name: setup go
+      uses: actions/setup-go@v2
+    - name: vet
+      run: go vet ./...