Added README for snappy builds

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snappy/README

@@ -4,3 +4,11 @@ http://code.google.com/p/snappy/downloads/detail?name=snappy-1.0.5.tar.gz
 This is compiled using gcc-4.6.2-glibc-2.13 on centos5.2
 and uses jemalloc. This is here so that one can compile leveldb to use
 snappy easily. 
+
+To compile,:
+cd ./snappy-1.0.5
+execute either make or compile.sh. 
+This will create *.so and *.a in snappy-1.0.5/.libs. 
+
+run unit tests:
+./snappy-1.0.5/snappy_unittest