notes on solvers in SSGrB

Author: rayegun

src/solvers/README.md

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+# Solvers for SuiteSparse:GraphBLAS
+
+The solver files here are mostly temporary wrappers while a couple things 
+(in no particular order and dependency) happen:
+
+1. In a future version of Julia conditional deps come about
+2. SparseArrays removal from sysimg
+3. SuiteSparse solvers are separated out from each other into their own pkgs
+
+Once those things occur this can hopefully be done more elegantly than essentially just
+reimplementing all the behavior.