Added cocoapods config.

Example of Podfile to add M3U8Kit to your project:

pod 'M3U8Kit', :git => 'https://github.com/Jeanvf/M3U8Paser.git', :branch => 'master'

To make it work properly, there should be tag v1.0 in the main repository. It should point to the latest commit including M3U8Kit.podspec file.