Update readme.

Author: Nong Li

README.md

@@ -1,3 +1,20 @@
 Parquet-cpp
 ===========
 A C++ library to read parquet files.
+
+To build you will need some version of boost installed and thrift 0.7+ installed.  
+(If you are building thrift from source, you will need to set the THRIFT_HOME env
+variable to the directory containing include/ and lib/.)
+
+Then run:
+<br>
+<code>
+cmake . 
+</code>
+<br>
+<code>
+make
+</code>
+
+The binaries will be built to ./bin which contains the libraries to link against as
+well as a few example executables.