[vello_shaders] Add a README
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+The `vello_shaders` crate provides a utility library to integrate the Vello shader modules into any
+renderer project. The create provides the necessary metadata to construct the individual compute
+pipelines on any GPU API while leaving the responsibility of all API interactions (such as
+resource management and command encoding) up to the client.
+
+The shaders can be pre-compiled to any target shading language at build time based on feature flags.
+Currently only WGSL and Metal Shading Language are supported.
