docs: add "README.md" file in repository

README.md

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+# Lablup Internship Onboarding Assignment - Web Chat
+This assignment involves implementing a web-based chat application using asyncio, aiohttp, and redis.
+## Contents in This Repository
+This repository includes both the chat server and the chat web application
+* `chat-server`: Chat server
+* `chat-web`: Chat web application
+* `backend.Dockerfile`: Dockerfile for the chat server
+* `frontend.Dockerfile`: Dockerfile for the chat web application
+* `docker-compose.yml`: Docker Compose configuration file
+* `build.sh`: Script to run Docker Compose automatically
+* `README.md`: This file
+## Run Automatically
+Since Docker Compose is used for automatic execution, Docker installation is required.
+### 권한 부여
+```bash
+chmod +x ./build.sh
+```
+### Run build.sh
+```bash
+./build.sh
+```
+If executed successfully, you can access the chat web application at localhost:3001.
+## Run Manually
+For manual execution instructions, please refer to the README.md file in each project directory.