Update README.md

Author: Jeremy H. Shi

README.md

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+This is a repo for course projects @ Professor Torsten Suel's course Web Search Engines.
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+1. Jcrawler : a primitive multi-threaded focused web crawler to collect web pages from www, with concentration on given key words. Language : python
+2. indexer : a c++ program to parse web pages, do reverse index, and generate final index for later query processing. involving massive data processing, file compression(var-byte).
+3. query processor, ask former built inverted index to answer user's search queries. 
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+4. Foursquare crawler and recommendation system : including a crawler to collect user, venue, rating, check in information from Foursquare, Twitter and Facebook, then apply machine learning algorithms (collaborative-filtering, SVD, etc) to recommend friends and venues to users.