welcome bot added

[Ankita297]

Related Issuse

welcome bot added Closes: #78

Describe the changes you've made

I have added a github action to greet the contributor who have opened their first PR or issue .

Checklist:

• [x ] My code follows the style guidelines of this project.
• [ x] I have performed a self-review of my own code.
• [ x] I have commented my code, particularly in hard-to-understand areas.
• [ x] I have made corresponding changes to the documentation.
• [ x] My changes generate no new warnings.

Screenshots

Original	Updated
original screenshot	updated screenshot

[Ankita297]

@harshit9270 @heysujal @AMAN123956 Please review my PR

[Ankita297]

@heysujal @AMAN123956 @harshit9270 please add the gssoc and level label

[Ankita297]

@heysujal @AMAN123956 @harshit9270 please add the gssoc and level label

[Ankita297]

@heysujal Sir please add the level label also Otherwise score will not be included .

[Ankita297]

@heysujal @AMAN123956 @harshit9270 ?