Add workflow

Author: jcs090218

.github/workflows/test.yml

@@ -0,0 +1,47 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  unix-test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        emacs_version:
+          - 27.1
+          - snapshot
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: purcell/setup-emacs@master
+        with:
+          version: ${{ matrix.emacs_version }}
+
+      - name: Run tests
+        run: 'make ci'
+
+  windows-test:
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        emacs-version:
+          - 27.1
+          - snapshot
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: jcs090218/setup-emacs-windows@master
+        with:
+          version: ${{ matrix.emacs-version }}
+
+      - name: Run tests
+        run: 'make ci'