adds in contributor guide (#71)

README.md

@@ -67,3 +67,21 @@ app.listen(8080);
   })
 }
 ```
+
+## Contributors
+
+Pull requests, issues and comments welcome. For pull requests:
+
+* Add tests for new features and bug fixes
+* Follow the existing style
+* Separate unrelated changes into multiple pull requests
+* See the existing issues for things to start contributing.
+
+For bigger changes, make sure you start a discussion first by creating an issue and explaining the intended change.
+
+Atlassian requires contributors to sign a Contributor License Agreement, known as a CLA. This serves as a record stating that the contributor is entitled to contribute the code/documentation/translation to the project and is willing to have it used in distributions and derivative works (or is willing to transfer ownership).
+
+Prior to accepting your contributions we ask that you please follow the appropriate link below to digitally sign the CLA. The Corporate CLA is for those who are contributing as a member of an organization and the individual CLA is for those contributing as an individual.
+
+* [CLA for corporate contributors](https://na2.docusign.net/Member/PowerFormSigning.aspx?PowerFormId=e1c17c66-ca4d-4aab-a953-2c231af4a20b)
+* [CLA for individuals](https://na2.docusign.net/Member/PowerFormSigning.aspx?PowerFormId=3f94fbdc-2fbe-46ac-b14c-5d152700ae5d)