Update .gitignore to exclude TypeScript build info and add dist directory. Expand README with project overview, technology stack, prerequisites, and instructions for running and testing the application.

.github/workflows/ci.yml

@@ -0,0 +1,43 @@
+name: ci
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  server:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-dotnet@v4
+        with:
+          global-json-file: global.json
+
+      - run: dotnet restore HSchool.slnx
+
+      - run: dotnet build HSchool.slnx --no-restore --configuration Release
+
+      # The AppHost tests run headless, so no Node install is needed here.
+      - run: dotnet test HSchool.slnx --no-build --configuration Release
+
+  client:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: src/HSchool.Client
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+          cache-dependency-path: src/HSchool.Client/package-lock.json
+
+      - run: npm ci
+
+      - run: npm run build
+
+      - run: npm test