Added Celero to the Debug Section.

Author: John Farrier

README.md

@@ -207,6 +207,7 @@ A curated list of awesome C/C++ frameworks, libraries, resources, and shiny thin
 
 * [Boost.Test](http://www.boost.org/doc/libs/master/libs/test/doc/html/index.html) - Boost Test Library. [Boost]
 * [Catch](https://github.com/philsquared/Catch) - A modern, C++-native, header-only, framework for unit-tests, TDD and BDD. [Boost]
+* [Celero](https://github.com/DigitalInBlue/Celero) - C++ Benchmarking Framework. [Apache 2.0]
 * [CppUnit](http://www.freedesktop.org/wiki/Software/cppunit/) - C++ port of JUnit. [LGPL2]
 * [CTest](http://www.cmake.org/cmake/help/v2.8.8/ctest.html) - The CMake test driver program. [BSD]
 * [googletest](http://code.google.com/p/googletest/) - Google C++ Testing Framework. [BSD]