Create CONTRIBUTING.md

Author: KarthikRIyer

CONTRIBUTING.md

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+Contributing to SwiftPlot
+==========================
+:+1::tada: Thanks for taking the time to contribute! :tada::+1:  
+If you'd like to report a bug or join in the development
+of SwiftPlot, then here are some notes on how to do that.
+
+## Contents
+* [Reporting bugs and opening issues](#reporting-bugs-and-opening-issues)
+* [Coding Guidelines](#coding-guidelines)
+    * [Pull Requests](#pull-requests)
+    * [Style Guide](#style-guide)
+    * [Git Commit Messages](#git-commit-messages)
+    
+## Reporting bugs and opening issues
+
+If you'd like to report a bug or open an issue then please:
+
+**Check if there is an existing issue.** If there is then please add
+   any more information that you have, or give it a 👍.
+
+When submitting an issue please describe the issue as clearly as possible, including how to
+reproduce the bug, which situations it appears in, what you expected to happen, and what actually happens.
+If you can include a screenshot it would be very helpful.
+
+## Coding Guidelines
+
+### Pull Requests
+
+We love pull requests, so be bold with them! Don't be afraid of going ahead
+and changing something, or adding a new feature. We're very happy to work with you
+to get your changes merged into SwiftPlot.
+
+If you've got an idea for a change then please discuss it in the open first, 
+either by opening an issue, through in the [Swift For TensorFlow mailing list](https://groups.google.com/a/tensorflow.org/forum/#!forum/swift) or through [email](mailto:[email protected]?subject=[GitHub]%20New%20issue%20in%20SwiftPlot).
+
+If you're looking for something to work on, have a look at the open issues in the repository [here](https://github.com/KarthikRIyer/swiftplot/issues).
+
+> We don't have a set format for Pull requests, but we expect you to list changes, bugs generated and other relevant things in PR message.
+
+### Style Guide
+
+We prefer to follow the [Swift Style Guide](https://google.github.io/swift/). You may also use [swift-format](https://github.com/google/swift/tree/format) to format your code.
+
+### Git Commit Messages
+
+* Use the present tense ("Add feature" not "Added feature").
+* Use the imperative mood ("Move cursor to..." not "Moves cursor to...").
+* Limit the first line to 72 characters or less.
+* Reference issues and pull requests liberally.
+
+Please start your commits with these prefixes for better understanding among collaboraters, based on the type of commit:
+
+* **feat**: Addition of a new feature.
+* **rfac**: Refactoring the code: optimization/different logic of exisiting code - output doesn't change, just the way of execution changes.
+* **docs**: Documenting the code, be it README, or extra commits.
+* **bfix**: Bug fixing.
+* **chor**: Chore: beautifying code, indents, spaces, camelcasing, changing variable names to have an appropriate meaning.
+* **ptch**: Patches: small changes in code, mainly those that change the appearance of things, for example default color of a plot, increasing size of text.
+* **conf**: Configurational settings: changing directory structure, updating gitignore, add dependencies/libraries, or making changes to Package.swift.