Add Promo shownotes.

promo.md

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+Welcome to my new podcast AppForce1: news and information for iOS app developers.
+Currently I'm working on getting all the details right.
+Soon I hope to be able to update you on a weekly basis on current news and events related to iOS app development.
+I will provide comments on the latest updates, tools and events relevant to iOS app developers.
+While I am developing my lauch format, please 
+Get in touch through twitter appforce1 or my website http://appforce1.net with your suggestions, tips or ideas.
+