added simple README

Author: s0lst1ce

README.md

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+# matrix
+
+Simple & extensible type-checked matrixes
+
+This was made as a learning project and thrives to provide matrices generic over any type.
+Some basic matrix manipulation operations are implemented for the matrix assuming the concrete type implements the required traits.
+The main selling point is that most operations fail to compile if the operation is impossible. This is done through the use of `min_const_generic` (rustc v1.51) and allows operations such as matrix product to always work if the code compiles.
+
+Although most operations implemented are done so with mathematical matrices in mind the type itself can be used for any use-case
+
+For how to use this crate, refer to [`Matrix`]