Add information retrieval book (#8608)

Author: happiestbee

Diff for: books/free-programming-books-subjects.md

@@ -344,6 +344,7 @@ Books that cover a specific programming language can be found in the  [BY PROGRA
 ### Information Retrieval
 
 * [Information Retrieval: A Survey](http://www.csee.umbc.edu/csee/research/cadip/readings/IR.report.120600.book.pdf) (PDF)
+* [Information Retrieval: Implementing and Evaluating Search Engines](https://mitmecsept.files.wordpress.com/2018/05/stefan-bc3bcttcher-charles-l-a-clarke-gordon-v-cormack-information-retrieval-implementing-and-evaluating-search-engines-2010-mit.pdf) - Stefan Böttcher, Charles L. A. Clarke, Gordon V. Cormack (PDF)
 * [Introduction to Information Retrieval](http://nlp.stanford.edu/IR-book/information-retrieval-book.html)