Add a new Feature to the App

[GauriKashyap]

This issue has no specific task assigned, this instead deals with one adding new features to the app.

This issue is open for all, so you guys can start adding your PR. Multiple people can work on this inorder to make the UI experience good and adding new meaningful features to it.

[SGI-CAPP-AT2]

Hey I would like to add replace feature to app

• [x] It'll Get a input of word inside text
• [x] it'll get input of word to replace the instances of word in text

thanks, ShGI

[ASANIYAN]

Hello, I would like to add a Capitalize feature to the app. It would change the first letter in a word to uppercase.