Merge pull request #3 from arm61/arm61-contributing-1

Create CONTRIBUTING.md

CONTRIBUTING.md

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+## Contributing
+
+If you are interested in contributing to pylj. Please feel free; fork the code and go wild to your hearts content. 
+
+#### Notes
+
+- We are trying to use a modular system within pylj, where there is the overarching `util` module that contains the `System` class which holds all system information. Examples of modules that use the `System` class are the `md` and `mc` module that facilite molecular dynamics and Monte-Carlo simulation respectively. 
+- All visuallisation should be done in the `sample` module, the structuring of this module should be clear and generally the only variable required should be the `System` class object. 
+- If you want any help implementing your idea, please feel free to discuss it on our [Slack channel](https://pylj.slack.com). We prefer this method of communication over email, however if you are morally or structurally aposed to Slack feel free to email [arm61](mailto:[email protected]).
+- If you would like to offer pull requests we will try our best to assess and merge them as appropriate in a timely manner.