adding 08_ctest to the table of contents

README.md

@@ -17,6 +17,7 @@ we run them in our CI.
  * [How to pass information from CMake to your code?](05_configure_file)
  * [How to get the current git hash at configure time?](06_git_configure)
  * [How to get the current git hash at build time?](07_git_build)
+ * [How to manage all the tests in your project?](08_ctest)
 
 ## Why CMake?
  * Automatically search for programs, libraries, and header files