Help: Insert link from CONTRIBUTING to build instructions

CONTRIBUTING.rst

@@ -24,7 +24,8 @@ CMake uses `Kitware's GitLab Instance`_ to manage development and code review.
 To contribute patches:
 
 #. Fork the upstream `CMake Repository`_ into a personal account.
-#. Run `Utilities/SetupForDevelopment.sh`_ for local configuration.
+#. Run `Utilities/SetupForDevelopment.sh`_ for local git configuration.
+#. See `Building CMake`_ for building CMake locally.
 #. See the `CMake Source Code Guide`_ for coding guidelines.
 #. Base all new work on the upstream ``master`` branch.
    Base work on the upstream ``release`` branch only if it fixes a
@@ -45,6 +46,7 @@ The merge request will enter the `CMake Review Process`_ for consideration.
 .. _`Kitware's GitLab Instance`: https://gitlab.kitware.com
 .. _`CMake Repository`: https://gitlab.kitware.com/cmake/cmake
 .. _`Utilities/SetupForDevelopment.sh`: Utilities/SetupForDevelopment.sh
+.. _`Building CMake`: README.rst#building-cmake
 .. _`CMake Source Code Guide`: Help/dev/source.rst
 .. _`commit messages`: Help/dev/review.rst#commit-messages
 .. _`CMake Review Process`: Help/dev/review.rst