mdhelp: add about doc

docs/markdown/about.md

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+##About
+
+This documentation forms part of the Tvheadend project.
+
+All rights reserved, and all implications of using, following, not 
+following, or in any way even being aware of this documentation are 
+expressly excluded. Use everything entirely at your own risk. If your 
+television explodes, your house burns down or your kittens end up in 
+tears, that's nothing to do with us.
+
+(c) 2006 - 2016 Tvheadend Foundation CIC
+
+##Licensing
+
+The entire project is currently licensed using [GPLv3](http://www.gnu.org/licenses/gpl-3.0.txt).
+
+##Further Information
+
+For more information regarding the project, licensing and contributions, please see:
+
+[Project website](https://tvheadend.org)
+
+[Contributor information](https://tvheadend.org/projects/tvheadend/wiki/Contributors)
+
+[Contributor Licensing Agreement](https://tvheadend.org/projects/tvheadend/wiki/CLA)