Issue#1181 fixed. Added Age Calculator Project

[ParnaRoyChowdhury777]

Have you read the Contributing Guidelines ?

Yes I have gone through the project contribution guidelines.

Description

I have added the Age Calculator Project under the intermediate section of Web Development. I have also updated the README of the Web Development section.

Fixes #1181

Checklist

• [x] I've read the contribution guidelines.
• [x] I've checked the issue list before deciding what to submit.
• [x] I've edited the README.md and link to my code.

Related Issues or Pull Requests

Fixes issue #1181