Added CONTRIBUTING.md

Author: PaulZC

CONTRIBUTING.md

@@ -0,0 +1,16 @@
+### How to Contribute
+
+Thank you so *much* for offering to help out. We truly appreciate it.
+
+If you'd like to contribute, start by searching through the [issues](https://github.com/sparkfun/SparkFun_BNO080_Arduino_Library/issues) and [pull requests](https://github.com/sparkfun/SparkFun_BNO080_Arduino_Library/pulls) to see whether someone else has raised a similar idea or question.
+
+If you decide to add a feature to this library, please create a PR following these best practices:
+
+- Change as little as possible. Do not sumbit a PR that changes 100 lines of whitespace. Break up into multiple PRs if necessary.
+- If you've added a new feature document it with a simple example sketch. This serves both as a test of your PR and as a quick way for users to quickly learn how to use your new feature.
+- If you add new functions also add them to keywords.txt so that they are properly highlighted in Arduino. [Read more](https://www.arduino.cc/en/Hacking/libraryTutorial).
+- Please submit your PR using the [release-candidate branch](https://github.com/sparkfun/SparkFun_BNO080_Arduino_Library/tree/release-candidate). That way, we can merge and test your PR quickly without changing the _master_ branch
+
+## Style guide
+
+Please read and follow the [Arduino API style guide](https://www.arduino.cc/en/Reference/APIStyleGuide). Also read and consider the [Arduino style guide](https://www.arduino.cc/en/Reference/StyleGuide).

README.md

@@ -29,6 +29,7 @@ Repository Contents
 * **/src** - Source files for the library (.cpp, .h).
 * **keywords.txt** - Keywords from this library that will be highlighted in the Arduino IDE.
 * **library.properties** - General library properties for the Arduino package manager.
+* **[CONTRIBUTING.md](https://github.com/sparkfun/SparkFun_BNO080_Arduino_Library/blob/master/CONTRIBUTING.md)** - guidance on how to contribute to this library.
 
 Documentation
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