Create Contributing.md

Author: OliverBScott

CONTRIBUTING.md

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+## Contributing
+
+Contributions to ScaffoldGraph will most likely fall into the following categories:
+
+1. Implementing a new Feature:
+    * New Features that fit into the scope of this package will be accepted. If you are unsure about the 
+      idea/design/implementation, feel free to post an issue.
+2. Fixing a Bug:
+    * Bug fixes are welcomed, please send a Pull Request each time a bug is encountered. When sending a Pull
+      Request please provide a clear description of the encountered bug. If unsure feel free to post an issue
+
+Please send Pull Requests to: 
+http://github.com/UCLCheminformatics/scaffoldgraph
+
+### Testing
+
+ScaffoldGraphs testing is located under `test/`. Run all tests using:
+
+```
+$ python setup.py test
+```
+
+or run an individual test: `pytest --no-cov tests/core`
+
+When contributing new features please include appropriate test files
+
+### Continuous Integration
+
+ScaffoldGraph uses Travis CI for continuous integration