doc: Add credits page.

source/credits.markdown

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+---
+Type:            credits
+Title:           Credits
+Project:         HandBrake
+Project_URL:     https://handbrake.fr/
+Project_Version: Latest
+Language:        English
+Language_Code:   en
+Text_Encoding:   utf-8
+Authors:         Bradley Sepos <bradley@bradleysepos.com> (BradleyS)
+Copyright:       2016 HandBrake Team
+License:         Creative Commons Attribution-ShareAlike 4.0 International
+License_Abbr:    CC BY-SA 4.0
+License_URL:     https://handbrake.fr/docs/license.html
+---
+
+Credits
+=======
+
+## Contributors
+
+HandBrake Documentation is an open source project created and maintained by the HandBrake Team. All are invited to participate: see [Contributing](https://github.com/HandBrake/HandBrake-docs/blob/master/CONTRIBUTING.markdown) for more information.
+
+Written contributions are listed on each individual article.
+
+[Contributors](https://github.com/HandBrake/HandBrake-docs/graphs/contributors) on GitHub shows all contributions tracked by git.
+
+## Blender Foundation
+
+[![Blender logo](images/blender.png)](https://www.blender.org)
+
+Portions of this documentation use screenshots and video courtesy of Blender Foundation. We wish to thank the foundation for their continued investment in open arts and technology.
+
+*Elephants Dream* ([CC BY 2.5](https://creativecommons.org/licenses/by/2.5/))  
+Copyright 2006 Blender Foundation  
+Netherlands Media Art Institute  
+[www.elephantsdream.org](http://www.elephantsdream.org)
+
+*Big Buck Bunny* ([CC BY 3.0](https://creativecommons.org/licenses/by/3.0/))  
+Copyright 2008 Blender Foundation  
+[www.bigbuckbunny.org](http://www.bigbuckbunny.org)
+
+*Sintel* ([CC BY 3.0](https://creativecommons.org/licenses/by/3.0/))  
+Copyright 2010 Blender Foundation  
+[www.sintel.org](http://www.sintel.org)
+
+*Tears of Steel* ([CC BY 3.0](https://creativecommons.org/licenses/by/3.0/))  
+Copyright 2012 Blender Foundation  
+[mango.blender.org](https://mango.blender.org/)
+
+*Cosmos Laundromat* ([CC BY 3.0](https://creativecommons.org/licenses/by/3.0/))  
+Copyright 2015 Blender Foundation  
+[gooseberry.blender.org](https://gooseberry.blender.org/)