phone number proper regex added

[Mugunth007]

PR Fixes:

Updated the phone number regex to handle optional country codes (0 or 91) and ensure the correct format for Indian phone numbers.
Fixed validation to allow numbers starting with digits from 6 to 9, followed by 9 digits.

Resolves #1668 1668

Checklist before requesting a review

• [Done] I have performed a self-review of my code
• [Done] I assure there is no similar/duplicate pull request regarding same issue

[devsargam]

It's better to ignore. The projects should be as generic as possible and not force it to be some certain things. Closing