[plugins.json] Add cocoapods-templates

[Oliver Letterer]

Please add the following entry to the plugins.json file:

{
  "gem": "cocoapods-templates",
  "name": "CocoaPods Templates",
  "author": "Oliver Letterer",
  "url": "https://github.com/layered-pieces/cocoapods-templates",
  "description": "Cocoapods plugin to install Xcode templates from a remote source"
}

[Orta Therox]

Thanks, added with 185ec4d