Basic structure of the project

- Added a model with in-memory database, and routes, controller and
middleware to enable making initial CRUD calls to endpoints;

- Added jest and an initial test.

package.json

@@ -5,8 +5,9 @@
   "main": "dist/app.js",
   "scripts": {
     "start": "tsc && node dist/app.js",
+    "dev": "nodemon --watch 'src/**/*.ts' --exec 'ts-node' src/app.ts",
     "lint": "eslint . --ext .ts",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "jest --watch"
   },
   "repository": {
     "type": "git",
@@ -23,8 +24,12 @@
   "devDependencies": {
     "@eslint/js": "^9.23.0",
     "@types/express": "^5.0.1",
+    "@types/jest": "^29.5.14",
     "eslint": "^9.23.0",
     "globals": "^16.0.0",
+    "jest": "^29.7.0",
+    "ts-jest": "^29.3.1",
+    "ts-node": "^10.9.2",
     "typescript": "^5.8.2",
     "typescript-eslint": "^8.29.0"
   },