Create README.md

Author: ShuhanYan

README.md

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+# CSES_IR
+Empirical Study For Code Search: IR-based methods
+
+This project reproduced Lucene-base Information Retrieval methods for code search, which focus more on Query Expansion and modifying similarity calculation approach to improve conventional code search performance.
+
+Methods include:
+
+* [Base Lucene](https://github.com/BASE-LAB-SJTU/CSES_IR/wiki/Base-Lucene)
+* [LuSearch](https://github.com/BASE-LAB-SJTU/CSES_IR/wiki/LuSearch)
+* [QECK](https://github.com/BASE-LAB-SJTU/CSES_IR/wiki/QECK)
+* [CodeHow](https://github.com/BASE-LAB-SJTU/CSES_IR/wiki/CodeHow)
+
+More information could be seen at [there](https://github.com/BASE-LAB-SJTU/CSES_IR/wiki).