Update README.md

llvm/test/VISC/DNN_Benchmarks/README.md

-
 # Directory Structure
 
 * ./benchmarks: code corresponding to each benchmark
-  ./benchmarks/${BENCH_NAME}/bin/approximate.py - script for running autotuner 
+  *  ./benchmarks/${BENCH_NAME}/bin/approximate.py: script for running autotuner
+  *  ./benchmarks/${BENCH_NAME}/Makefile: benchmark build script
 * ./common:
-  ./common/include: include files
-  ./common/bin: path setup files - modify paths to HPVM Build and SRC as per installation
+  * ./common/include: include files
+  * ./common/bin/setup_tyler_paths.sh: modify paths to HPVM Build and SRC as per installation
+    * REQUIRED to run before building benchmarks 
+   
   
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