create contributing guidelines

Author: PareshMayani

CONTRIBUTING.md

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+#Contributing to Learning Resources repository by GDG Ahmedabad
+
+We'd love for you to contribute to our source code and to make this initiative even better than it is
+today! Here are the guidelines we'd like you to follow:
+
+- [Submission Guidelines](#submit)
+
+## <a name="submit"></a> Submission Guidelines
+
+### Submitting any links/books/tutorials or any resources
+Before you submit/suggest any resources please search the archive, maybe your resources is already included and available in the list. If the resource/links/materials you want to share is not in the list then you can commit and send a PR.
+
+### Formatting guidelines
+We are following below formatting options for each commits:
+* H3 (i.e. ###) for the header 
+* - (i.e. hyphen) for the list
+* []() for links. For example, [Learning resources repo](https://github.com/GDGAhmedabad/Learning-Resources/)
+
+For formatting guidelines, check the guidelines given by Github [https://help.github.com/articles/basic-writing-and-formatting-syntax/](https://help.github.com/articles/basic-writing-and-formatting-syntax/)
+
+For reference, you can check this page [https://github.com/GDGAhmedabad/Learning-Resources/blob/master/android/Useful_links.md](https://github.com/GDGAhmedabad/Learning-Resources/blob/master/android/Useful_links.md)
+
+
+
+### Submitting a Pull Request
+Before you submit your pull request consider the following guidelines:
+
+* Search [GitHub](https://github.com/GDGAhmedabad/Learning-Resources/pulls) for an open or closed Pull Request
+  that relates to your submission. We don't want to duplicate effort!
+* Make your changes in a new git branch. Please be aware that we are following the [git flow branching model](http://nvie.com/posts/a-successful-git-branching-model/) with `master` as the branch for the next version!
+* Commit your changes using a descriptive commit message. 
+  
+
+
+