Provide documentation for setting up Auto Deploy

[freak4pc]

In continuation to #44 - This PR introduces documentation for setting up Auto Deploys of CocoaPod specs on Releases.

Would really love some feedback from anyone interesting in @RxSwiftCommunity/contributors, and even more specifically @ashfurrow and possibly @orta who knows this topic (and CocoaPods) better than most.

Also, @bobgodwinx - I remember you wanted to set this up for RxCoreLocation, so I'd love it if you could try the guide and give me some feedback.

Thanks for your time !

Read friendly: https://github.com/RxSwiftCommunity/contributors/blob/102e086d369149a1434d16b5248f010c4898ce7d/Automatic%20Deploys.md

[freak4pc]

Sidenote: I plan on providing Circle CI v2 information later on, but right now this provides examples of v1. I plan on migrating some repos in the upcoming weeks so will update at a later time.