Add Skygear (#715)

* Add Skygear

* Move Skygear to Misc/Other category

* Update Skygear license to `Apache`

README.md

@@ -643,6 +643,7 @@ See also <https://en.wikipedia.org/wiki/List_of_streaming_media_systems>, <https
   * [King Phisher](https://github.com/securestate/king-phisher) - King Phisher is a tool for testing and promoting user awareness by simulating real world phishing attacks. `BSD` `Python`
   * [Mindmaps](https://github.com/drichard/mindmaps) - An open source, offline capable, mind mapping application. ([Demo](http://drichard.org/mindmaps/)) `AGPLv3` `HTML5`
   * [Para](http://www.paraio.org) - Para is a flexible and modular backend framework/server for object persistence, API development and authentication. ([Source Code](https://github.com/erudika/para)) `Apache` `Java`
+  * [Skygear](https://skygear.io) - A complete backend server for web, mobile and iOT applcations. ([Demo](https://portal.skygear.io), [Source Code](https://github.com/SkygearIO/skygear-server)) `Apache` `Go`
   * [webtrees](https://www.webtrees.net) - webtrees is the web's leading on-line collaborative genealogy application. ([Demo](https://dev.webtrees.net/demo-stable/index.php?ctype=gedcom&ged=demo), [Source Code](https://github.com/fisharebest/webtrees)) `GPLv3` `PHP`
 
 ## Money, Budgeting and Management