Readme.md : Fixed the link of COC and Contributing Guideline

[itsarkcodes]

Fixes Issue

This PR fixes the following issues: Links for COC and Contributing Guidelines in Readme.md

#example

Changes proposed

Earlier the links were not working for COC and Contribution Guideline as the path was wrong. So changed the path of the those files and now when we click it redirects to the following file

Check List (Check all the boxes which are applicable)

• [X ] My code follows the code style of this project.
• [X ] My change requires a change to the documentation.
• I have updated the documentation accordingly.
• All new and existing tests passed.
• [X ] This PR does not contain plagiarized content.
• [ X] The title of my pull request is a short description of the requested changes.