Updating README.md file with clone instructions.

README.md

+# Requirements
+* C compiler. gcc 4.8 tested
+* Git
+* CMake. 2.8.12.2 tested.
+
+# Getting Started
+* You will need to save your ssh-key in [code.ornl.gov](https://code.ornl.gov/profile/keys).
+* Clone radix
+`git clone git@code.ornl.gov:jap/radix.git ~/radix`
+* Change directory into radix `cd ~/radix`
+* Clone TriBITS
+`git clone https://github.com/lefebvre/TriBITS.git TriBITS` [TriBITS documentation](https://tribits.org/doc/TribitsDevelopersGuide.html)
+* Clone extra repos
+`./TriBITS/tribits/ci_support/clone_extra_repos.py`
+* Create a build directory
+`mkdir -p ~/build/radix`
+* Change into the build `cd ~/build/radix`
+* Create a configuration script in ~/build/. Lets call is ../configure.sh(linux), ..\configure.bat(windows)
+
+```
+#!/bin/bash
+# Linux bash file example
+rm -rf CMake*
+cmake \
+ -D CMAKE_BUILD_TYPE:STRING=RELEASE \
+ -D radix_ENABLE_ALL_PACKAGES:BOOL=ON \
+ -D radix_ENABLE_TESTS:BOOL=ON \
+ -G "Unix Makefiles" \
+ ~/radix
+```
+```
+rem Windows MinGW bat file example
+del /S /Q CMake*
+cmake ^
+ -D CMAKE_BUILD_TYPE:STRING=RELEASE ^
+ -D radix_ENABLE_ALL_PACKAGES:BOOL=ON ^
+ -D radix_ENABLE_TESTS:BOOL=ON ^
+ -G "MinGW Makefiles" ^
+ ~/radix
+```
+
+* Invoke configure script in the build directory.
+`../configure.sh or ..\configure.bat`
+  * I place the configure script in the build directory as opposed to the build/radix directory because it allows me to delete the build/radix
+directory without removing my script.