Added Mark Down Editor App

[its-kumar-yash]

Title and Issue number

I solved the issue #255 , and added a markdown editor.

Issue No. : Fixes #255

Code Stack : React

Checklist:

• [X] I have mentioned the issue number in my Pull Request.
• [] I have commented my code, particularly in hard-to-understand areas
• [] I have created a helpful and easy to understand README.md
• [X] I have updated the Index.html file for my contribution

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