[feat] Issue and PR template

[octonawish-akcodes]

It would be really easy for new contributors to add things at the relevant positions while raising an issue or PR, so adding of both templates can be beneficial.

[kaiwalyakoparkar]

@octonawish-akcodes thank you so much for this suggestion.

[octonawish-akcodes]

I can work on this @kaiwalyakoparkar

also, Is there not any /assign role?

[kaiwalyakoparkar]

@octonawish-akcodes assigned to you