Updated README.md to reference the nebel utility

Author: fbolton

README.md

@@ -5,3 +5,4 @@ This repo contains a collection of python-based tools to make life easier for wr
 * **fixes**	changes module subheadings from `[discrete]==` to `.`
 * **git-export** fixes spacing issues
 * **newdoc** generates empty module and assembly files when writing Red Hat or Fedora documentation in AsciiDoc
+* **nebel** general purpose utility for creating and maintaining modular content - see the [README](./nebel/README.adoc) for details