Hello
I am new to Unity 5 and I downloaded builtin_shaders-5.0.0.zip from Unity.
Unfortunately I don`t know how can I use it.
Please help me if anyone know it.
Regards
You don’t need to use it. All those shaders are, as the name implies, built-in to Unity already.
That package is provided for developers who might want to examine the source code for those shaders in order to understand more how they work, or modify them as a base for their own shaders.