Cocoapod implemented

[Vadim-Bulavin]

Instructions to test this PR.

1. Create project named 'Test'.
2. Open terminal.
3. Type cd path/to/Test
4. pod init
5. Copy below text into created podfile:

target 'Test' do
  # Comment the next line if you're not using Swift and don't want to use dynamic frameworks
  use_frameworks!

  pod 'EmbeddedSocial', :git => 'https://github.com/Microsoft/EmbeddedSocial-iOS-SDK.git', :branch => 'vbulavin/issue_537', :submodules => true

  target 'TestUITests' do
    inherit! :search_paths
    # Pods for testing
  end

end

post_install do |installer|
  installer.pods_project.targets.each do |target|
      target.build_configurations.each do |config|
        config.build_settings['SWIFT_VERSION'] = ‘3.2’
    end
  end
end

6. pod install
7. import EmbeddedSocial into AppDelegate of the new project.

[msftclas]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

:x: Vadim-Bulavin sign now
_{You have signed the CLA already but the status is still pending? Let us recheck it.}