Added build instructions to README.

Updated gitignore to ignore test hpps.

Author: rhyolight

.gitignore

@@ -19,5 +19,8 @@ build/scripts/
 build/release/
 build/temp/
 
+src/test/testeverything/everything_addtests.hpp
+src/test/testeverything/everything_headers.hpp
+
 # /
 /.gdb_history

README.md

@@ -5,3 +5,29 @@
 **This README is incomplete!**
 
 This repository contains the C++ source code for the Numenta Platform for Intelligent Computing ([NuPIC](http://numenta.org/nupic.html)). It will eventually contain all algorithms for NuPIC, but is currently in a transition period. For details on building NuPIC within the python environment, please see http://github.com/numenta/nupic.
+
+## Build and test NuPIC Core:
+
+Important notes:
+ * $REPOSITORY is the current location of the repository that you downloaded from GitHub.
+
+### Using command line
+
+#### Configure and generate build files:
+
+    mkdir -p $REPOSITORY/build/scripts
+    cd $REPOSITORY/build/scripts
+    cmake $REPOSITORY
+
+#### Build:
+
+    cd $REPOSITORY/build/scripts
+    make -j3
+    
+> **Note**: -j3 option specify '3' as the maximum number of parallel jobs/threads that Make will use during the build in order to gain speed. However, you can increase this number depending your CPU.
+
+#### Run the C++ tests:
+
+    cd $REPOSITORY/build/release/bin
+    htmtest
+    testeverything