Update README.md

[antoninklopp]

Updated README after Issue #451 .

A good idea could also be to add the shader in the GraphicsSettings from the sample project and explain everything in a Build.MD since some of the README.md is directly related to build explanations.

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[marcspraragen]

Hi-- is there an update of readme.md I could look at?

[antoninklopp]

Hi,

I will push a new update because I need to tell that the build on android should include both shaders

[antoninklopp]

Hi @marcspraragen ,

I just pushed the update