Add README for lax

Author: termoshtt

lax/README.md

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+Linear Algebra eXtension (LAX)
+===============================
+
+ndarray-free safe Rust wrapper for LAPACK FFI for implementing ndarray-linalg crate.
+This crate responsibles for
+
+- Linking to LAPACK shared/static libraries
+- Dispatching to LAPACK routines based on scalar types by using `Lapack` trait
+
+Features
+---------
+
+| Feature          | Link type      | Description |
+|:-----------------|:---------------|:----------------------------------------|
+| openblas-static  | static         | Build OpenBLAS, and link it statically  |
+| openblas-system  | dynamic/static | Seek OpenBLAS in system (e.g. `/usr/lib/libopenblas.so`), and link it. Shared library (use dynamic linking) is prior to static library (`libopenblas.a`) |
+| netlib-static    | static         | Same as openblas-static except for using reference LAPACK |
+| netlib-system    | dynamic/static | Same as openblas-system except for using reference LAPACK |
+| intel-mkl-static | static         | Seek static library of Intel MKL from system, or download if not found, and link it statically |
+| intel-mkl-system | dynamic        | Seek shared library of Intel MKL from system, and link it dynamically |