add readme

Author: lmh921000132974

multi-package_libs_instances/README.md

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+README
+------
+###Introduction:
+This sub-directory contains the ground truth libraries, LibD detection results, and LibRader detection results for the 1,000 sample apps in Section IV-F.
+
+###File list: 
+	./totalmultimodules.py: count the number of occurance of diffrerent structures all the multi-pacakge instances in folder "/multimodules".
+	./totalmultimodules.txt: records the number of different structures.  
+	./multimodules/*: provides all the multi-package instances which are filtered from our database.