Added benchmark_projects dir README

Author: pConst

benchmark_projects/README.md

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+readme for "benchmark_projects" directory
+published as part of https://github.com/pConst/basic_verilog
+Konstantin Pavlov, [email protected]
+
+
+The directory contains single reference System Verilog codebase, compiled consistently for multiple FPGA platforms and vendors. 
+
+Supported and committed IDE projects include
+* Xilinx ISE
+* Xilinx Vivado
+* Intel Quartus
+* Gowin IDE
+
+Currently working on
+* Microsemi Libero
+* Lattice iCEcube
+* Lattice FOSS toolchain
+
+See comparative compile time results in ./benchmark_results.txt
+
+
+