Add Issue, Bug and Pull Request Template

[Aniket762]

With the label of Hacktoberfest and contributors flowing in and super enthusiastic about contributing to this awesome project. I feel adding issue and pull request templates will make the process of code review more structured and easier to follow up.

Personally, I also believe adding a greetings bot will make the contributors feel more at home. Let me know what you think team!

[saswatsamal]

This is great, should I assign you to add the bot?

[Aniket762]

This is great, should I assign you to add the bot?

Sure, assign it to me! 🤓

[saswatsamal]

Assigned! :)