Fix/add docker setup- Add: Docker setup and troubleshooting section in README.md and test fun. in app.py (Kalvium FOSS onboarding)

[dhananjayn875]

🐳 Summary

This PR adds a Docker setup and troubleshooting section to the README, helping new contributors quickly run and test the project in containers. Tested on Ubuntu 24.04 LTS with Docker 24.x.
Verified using both docker build and docker run commands.

✅ Changes

• Added Docker setup steps for Ubuntu/Linux users.
• Added common Docker troubleshooting commands.
• Verified that the project runs successfully using:

     docker build -t vscode-python-app .
     docker run -it -p 8000:8000 vscode-python-app
  

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