Update README.md

Author: nesquena

README.md

@@ -11,3 +11,13 @@ We have guides for everyone whether you are **beginner, intermediate or advanced
 Ever been **frustrated finding information on outdated one-off blog posts and tutorials** that has since become irrelevant? How many times were you googling only to find your answer only on a **2 year old StackOverflow post**? We believe there's got to be a better way. Why not have the community work together to create useful and detailed documentation for every aspect of Android (or any platform)? There's absolutely no reason that we should have to make do with outdated, vague or un-editable content anymore.
 
 Read about our [[mission to change the way engineers learn new technologies|The CodePath Goal]] and we would love for you to [get involved](https://github.com/thecodepath/android_guides/wiki/The-CodePath-Goal#how-do-i-help)! In addition, we are a fledgling startup so if you like this guide and what we are trying to do, please consider following us on twitter [@thecodepath](https://twitter.com/thecodepath) or [tipping via gittip](https://www.gittip.com/nesquena/)! 
+
+## Contributors
+
+These guides were originally created and adapted by [Nathan Esquenazi](http://github.com/nesquena) 
+as a part of our [CodePath](http://thecodepath.com) training and bootcamps. We have also had contributions from many
+community members including:
+
+ * [Trevor](https://github.com/trevor-e)
+
+If you are interested in contributing, check out our [contribution guidelines](https://github.com/thecodepath/android_guides/wiki/Contributing-Guidelines) for this project.