add contribute file

CONTRIBUTING.md

@@ -0,0 +1,65 @@
+
+To contribute to this GitHub project, you can follow these steps:
+
+1. Fork the repository you want to contribute to by clicking the "Fork" button on the project page.
+
+2. Clone the repository to your local machine using the following command:
+
+```
+git clone https://github.com/<YOUR-GITHUB-USERNAME>/DB-GPT
+```
+3. Install the project requirements
+```
+pip install -r requirements.txt
+```
+4. Install pre-commit hooks
+```
+pre-commit install
+```
+5. Create a new branch for your changes using the following command:
+
+```
+git checkout -b "branch-name"
+```
+6. Make your changes to the code or documentation.
+- Example: Improve User Interface or Add Documentation.
+
+
+7. Add the changes to the staging area using the following command:
+```
+git add .
+```
+
+8. Commit the changes with a meaningful commit message using the following command:
+```
+git commit -m "your commit message"
+```
+9. Push the changes to your forked repository using the following command:
+```
+git push origin branch-name
+```
+10. Go to the GitHub website and navigate to your forked repository.
+
+11. Click the "New pull request" button.
+
+12. Select the branch you just pushed to and the branch you want to merge into on the original repository.
+
+13. Add a description of your changes and click the "Create pull request" button.
+
+14. Wait for the project maintainer to review your changes and provide feedback.
+
+15. Make any necessary changes based on feedback and repeat steps 5-12 until your changes are accepted and merged into the main project.
+
+16. Once your changes are merged, you can update your forked repository and local copy of the repository with the following commands:
+
+```
+git fetch upstream
+git checkout master
+git merge upstream/master
+```
+Finally, delete the branch you created with the following command:
+```
+git branch -d branch-name
+```
+That's it you made it 🐣⭐⭐
+