add: test and lint workflows

.github/workflows/lint.yml

@@ -0,0 +1,12 @@
+name: Lint
+on: [pull_request, push]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Prettify code
+        uses: creyD/prettier_action@v4.2
+        with:
+          prettier_options: --check src

.github/workflows/test.yml

@@ -0,0 +1,12 @@
+name: Test
+on: [pull_request, push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: |
+          npm install
+      - run: |
+          npm run test