Update README.md

[arup1221]

Contributing

added an excluded repo from hacktoberfest into excluded repo list and this is valid excluded repo you can check If you want to add a project to this list, please make sure that:

• [x] You read the contributing guide
• [x] The repository has hacktoberfest as topic and counts for hacktoberfest event
• [x] The project can't be just an "add your name" or simply + 1 contribution to hacktoberfest
• [x] Place them in alphabetical order
• [x] One repository per PR/contribution - avoid conflicts and simplify review
• [x] Your pull request is not spammy just adding an empty line, otherwise it will be marked as invalid and not count to hacktoberfest.

If they meet the requirements above, feel free to create a PR. Happy Hacking! ✨

Here I added a repository Keploy. It participated in Hacktoberfest 2023 and it is for Intermediate/Advance coders.