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

.devcontainer/docker-compose.yml

@@ -0,0 +1,16 @@
+version: '3.8'
+
+services:
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    volumes:
+      - ..:/workspace:cached
+    ports:
+      - "3000:3000"
+      - "3001:3001" 
+      - "9229:9229"
+      - "9230:9230"
+    command: sleep infinity
+    working_dir: /workspace