YouTube Embed Configuration

Added options for YouTube embed configuration:

- ytControls:  Whether the video player controls will display

- ytShowInfo: Display information like the video title and uploader
before the video starts playing

- ytAutoHide: Whether the player's video controls will automatically
hide after a video begins playing

- ytModestBranding:  Lets you use a YouTube player that does not show a
YouTube logo

- ytRel: Whether the player should show related videos when playback of
the initial video ends
Update README

- Updated documentation for configuration options.
- Set default  for ytControls to match YouTube’s default value.