added a README

for documentation

contrib/largeNbDicts/README.md

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+largeNbDicts
+=====================
+
+`largeNbDicts` is a benchmark test tool
+dedicated to the specific scenario of
+dictionary decompression using a very large number of dictionaries,
+which suffers from increased latency due to cache misses.
+It's created in a bid to investigate performance for this scenario,
+and experiment mitigation techniques.
+
+Command line :
+```
+$ largeNbDicts filename [Options]
+Options :
+--clevel=#     : use compression level # (default: 3)
+--blockSize=#  : cut input into blocks of size # (default: 4096)
+--dictionary=# : use # as a dictionary (default: create one)
+--nbDicts=#    : set nb of dictionaries to # (default: one per block)
+```