Android_guides: Guide on setting up and using Crashlytics

Hi,
I'm working on this :wink:

Great! See contribution guidelines here https://github.com/codepath/android_guides/wiki/Contributing-Guidelines#creating-topic-drafts-online and post your draft here when ready for review

Hi again,
Here is draft version.
This is my first time, so please be patient :wink:. Codes come from official documentation.
Please let me know if everything is ok.

@DonMat This is a great start, thanks! Draft is now on the wiki here: https://github.com/codepath/android_guides/wiki/Crash-Reporting-with-Crashlytics with an attribution to your original authorship at the bottom.

Can a few others please look through this guide and help clean up any typos, fix the heading structure as needed, etc.

Thanks again!