add workflow and readme

.github/workflows/ci.yaml

@@ -0,0 +1,24 @@
+name: CI
+
+on:
+  workflow_dispatch
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  ci:
+    name: CI
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Build
+        run: make build
+        env:
+          VERSION: latest
+      - name: Test
+        run: make test