Update README.md

README.md

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 Git and GitHub PlayGround is a playground for Code Newbies to learn and practice using Git and GitHub. It include introductory content, practicals or exercises, guides, tutorials and how-tos, all easy to understand.
 
-## How to Contribute ?
+## How to Contribute to this repo?
 This is a new project. Got ideas? Open an issue [here](https://github.com/Ruth-ikegah/Git-and-GitHub-PlayGround/issues)