We welcome you to work on our open source projects!
If you want to contribute back to our repositories, we need to ask you to complete the Contributor License Agreement (CLA). It is a legal document in which Open Source project community members state that they are entitled to contribute the code/documentation/translation to the project and are willing to have it used in distributions and derivative works.
This license is for your protection as a contributor as well as ours; it does not change your rights to use your own contributions for any other purposes. The agreement clarifies the ability for us to incorporate your contributions. You only need to complete this once, and then you'll be able to contribute to any other of our projects.