(#13695) add README about puppetlabs_spec_helper

diff --git a/README_SPECS.markdown b/README_SPECS.markdown
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+NOTE
+====
+
+This project's specs depend on puppet core, and thus they require the
+`puppetlabs_spec_helper` project.  For more information please see the README
+in that project, which can be found here: [puppetlabs spec
+helper](https://github.com/puppetlabs/puppetlabs_spec_helper)