adding replit url to README.md

[AlejandroSolares]

Summary of your changes

Description

Added replit url to the README.md, its a great site for remote teamworking on thinkering projects or tiny projects.

Checklist

• Added to Readme on line 270 REPLIT entry

• [x] My change follows the Contributing Guidelines
• [x] I have added only one new link to the list.
• [x] I have checked that the link that I added does NOT exist in the project already.
• [x] I have sorted the link alphabetically under the related section.