feat: init-express-backend (#6)

Reviewed-on: #6
Co-authored-by: Clement <c.boesmier@aptatio.com>
Co-committed-by: Clement <c.boesmier@aptatio.com>

.github/workflows/run_back_test.yml

@@ -0,0 +1,19 @@
+name: Test and coverage
+on:
+  pull_request:
+    branches:
+      - '*'
+jobs:
+  coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ArtiomTr/jest-coverage-report-action@v2
+        with:
+          working-directory: Express/barAndCafe
+          test-script: npm run test
+          output: comment, report-markdown
+          prnumber: ${{ steps.findPr.outputs.number }}
+          custom-title: Coverage report for backend
+          github-token: ${{ secrets.PR_TOCKEN}}
+          annotations: none #disable annotation