Thank you for your interest in contributing!
Unfortunately there are some legal hurdles. Sorry about that.
This repository is a Google open source project, and so we require contributors to sign Google's open source Contributor License Agreement. It's easy to do, just click here to sign as an individual or corporation. Individuals can sign electronically in seconds (see the bottom of the page); corporations will need to email a PDF, or mail.
We cannot accept PRs or patches larger than fixing typos and the like without a signed CLA.
If your Github account doesn't show the name your used to sign, please mention your name in your PR.