cms1-25: Create endpoint for a student to enroll in a course

[thanthtooaung-coding]

🧩 Task: Create endpoint for a student to enroll in a course

🧾 README: https://github.com/thanthtooaung-coding/lms-grpc/blob/main/README.md
🧾 API Documentation: https://docs.google.com/document/d/1P_5quhTcU9Q8OcNcBzGUCOMTKpP4FzRTWI6YpdaIjD0/edit?tab=t.0

🌿 Git Workflow Instructions

1. Sync with dev branch

Before starting work:

git checkout dev
git pull origin dev

2. Create a new feature branch

git switch -c ft/cms1-25

3. Make your changes

Work on your task as described above.

4. Add and commit your changes

Use git commit to create a conventional commit message:

git add . or git add file1.go file2.go
git commit -m "your commit-message"

✅ Write the appropriate commit message with your changes

5. Push your branch

git push origin ft/cms1-25

✅ Once done

Open a Pull Request to dev and request a review.

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Let me know if you want me to generate a scaffold or example code block for any part of this!