feat: add fullstack TypeScript template with Docker support

- Created package.json for managing workspaces (frontend and backend)
- Added scripts for development, build, testing, and Docker operations
- Implemented kill-dev-processes.sh script to terminate development processes gracefully

package.json

@@ -0,0 +1,43 @@
+{
+  "name": "fullstack-typescript-template",
+  "version": "1.0.0",
+  "description": "Full Stack TypeScript Template with React Frontend and Express Backend",
+  "private": true,
+  "workspaces": [
+    "backend",
+    "frontend"
+  ],
+  "scripts": {
+    "install:all": "npm install && npm install --workspace backend && npm install --workspace frontend",
+    "dev": "concurrently \"npm run dev:backend\" \"npm run dev:frontend\"",
+    "dev:backend": "npm run dev --workspace backend",
+    "dev:frontend": "npm run start --workspace frontend",
+    "build": "npm run build --workspace backend && npm run build --workspace frontend",
+    "build:backend": "npm run build --workspace backend",
+    "build:frontend": "npm run build --workspace frontend",
+    "test": "npm run test --workspace backend && npm run test --workspace frontend",
+    "test:backend": "npm run test --workspace backend",
+    "test:frontend": "npm run test --workspace frontend",
+    "clean": "rm -rf node_modules backend/node_modules frontend/node_modules backend/dist frontend/build",
+    "clean:build": "rm -rf backend/dist frontend/build",
+    "docker:build": "docker build -t fullstack-app .",
+    "docker:up": "docker-compose up -d",
+    "docker:down": "docker-compose down",
+    "docker:stop": "docker-compose stop",
+    "docker:restart": "docker-compose restart",
+    "docker:logs": "docker-compose logs -f",
+    "docker:logs:app": "docker-compose logs -f app",
+    "docker:logs:db": "docker-compose logs -f postgres",
+    "docker:clean": "docker-compose down -v --remove-orphans && docker system prune -f",
+    "docker:dev": "docker-compose up --build",
+    "docker:prod": "NODE_ENV=production docker-compose up -d --build",
+    "kill:dev": "./scripts/kill-dev-processes.sh"
+  },
+  "devDependencies": {
+    "concurrently": "^8.2.2"
+  },
+  "engines": {
+    "node": ">=18.0.0",
+    "npm": ">=9.0.0"
+  }
+}