Add Contributing.md File

[EfazAhmed]

Fixed #23

• This Pull Request is adding a markdown file that gives pod members an opportunity to gain a better understanding of how to create Pull Requests (PRs).
• This is important because Pull Requests and Issues can be intimidating to novices of GitHub. Therefore, this markdown file can be a very good first step to creating your very own Pull Request. Everyone's contribution is important no matter how big or small they are, so feel free to take a look and use this as a resource if you are new to Open Source contributions.

Please, go through these steps before you submit a PR.

• [x] My Pod Leader knows I'm working on this Pull Request
• [x] I've explained what the Pull Request is adding.
• [x] I've explained why this is important.

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