Add documentation for plugins#820
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Add documentation for the plugin system and for modifying the control tree to make custom operations. Details: - `docs/PluginHowTo.md` describes in a "tutorial style" how to implement a custom BLAS-like operation by creating a plugin and then modifying the `gemm` control tree to achieve the desired effect. - Briefly, plugins allow users to add new kernels and associated block sizes/preferences to BLIS without modifying the BLIS source code. User-provided kernels are compiled using the BLIS build system for configured architectures and selected at runtime based on the actual hardware. - To implement custom operations, users can combine their own kernels (and/or existing BLIS kernels) with a customized control tree, which represents the specific algorithmic steps. Users can customize the kernels to be used for packing and for computation, extra information passed to kernels (e.g. additional parameters or data), block sizes, etc. An API is provided for modifying the default `gemm` control tree (also used for other level-3 operations, except `trsm`). - [cherry-picked from 5cb70d8]
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