feat: add workflow to test app

.github/workflows/test-application.yml

@@ -0,0 +1,23 @@
+name: Test Application
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    types: [opened, reopened, synchronize]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+      - name: Use Node 14
+        uses: actions/setup-node@v2.1.2
+        with:
+          node-version: 14
+      - name: Install dependencies with yarn
+        run: yarn install --frozen-lockfile
+      - name: Run test command
+        run: yarn test

docs/TODOS.md

@@ -2,4 +2,3 @@
 
 - add stylelint configuration
 - add css reset
-- add action for testing linting and prettiering on push