Vaibhav

There are a number of typing mistakes in the readme file. This PR fixed those errors.

Added a back to the top option in the readme file to scroll on clicking.

Create iO8Q2l.cpp

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# 📑 DESCRIPTION Issue Number : #1603 ### ❓ What has been changed : Wrote the c++ code of longest common substring problem. Fixes #1603 Fixes #1603

Can I add a Trie based project on dictionary in c++ in the cpp projects.

Bank Mangement system

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Can I add a bank management project in cpp projects.