add GitHub Actions workflow for testing on pull requests

.github/workflows/test.yml-template

@@ -0,0 +1,23 @@
+name: Test
+
+on:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [20.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: npm install
+    - run: npm test

readme.md

@@ -1,8 +1,8 @@
-# Chat (with Node.js) 
+# Chat (with Node.js)
 Implement a chat application (both client and server)
 
-- You type a username and send it to the server
-- It is now username (save it in localStorage)
+- You type a username and send it to the server.
+- It is now username (save it in localStorage).
 - All the messages should have an author, time and text
 - Implement an ability to create rooms (create / rename / join / delete)
 - New user should see all prev messages in the room