Added readme

Author: deni2312

README.md

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 ## Demos
 
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+### Diligent Backend Demo
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+A demo that shows all the  features implemented with the Diligent Backend
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+https://youtube.com/watch?si=i_kFfJJ4FhN71HG0&v=A6Amrfwip54
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+[![Sponza](https://img.youtube.com/vi/A6Amrfwip54/0.jpg)](https://www.youtube.com/watch?v=A6Amrfwip54)
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 ### Soft bodies
 
 An example of a Sponza scene with softbodies