Add Issue and PR Template

[muthuannamalai12]

Would like to add issue and pr templates to these project that will basically explain the type of issue and its description and also the type of pr the set of checklist that it obeys and its description

Kindly assign this to me as a part of Girl Script Summer of Code. I would love to do it

[rakshakannu]

@muthuannamalai12 I would like you to do this as soon as possible so that me and other participants can get an idea of how to make a PR! thanks! :)