.github: add test workflow

Author: giannimassi

.github/FUNDING.yml

@@ -0,0 +1 @@
+giannimassi

.github/workflows/test.yml

@@ -0,0 +1,26 @@
+on: [push, pull_request]
+name: Test and Build
+jobs:
+  test:
+    strategy:
+      matrix:
+        go-version: [1.14.4]
+        platform: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.platform }}
+    steps:
+    - uses: actions/cache@v2
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+    - name: Install Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: ${{ matrix.go-version }}
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - name: Test
+      run: go test ./...
+    - name: Build
+      run: go build ./...