Merge pull request #227 from brian-rose/add-guide-link

Add link to cookbook guide

Author: brian-rose

README.md

@@ -6,6 +6,8 @@
 [![Binder](https://binder.projectpythia.org/badge_logo.svg)](https://binder.projectpythia.org/v2/gh/ProjectPythia/cookbook-template/main?labpath=notebooks)
 [![DOI](https://zenodo.org/badge/475509405.svg)](https://zenodo.org/badge/latestdoi/475509405)
 
+_See the [Cookbook Contributor's Guide](https://projectpythia.org/cookbook-guide) for step-by-step instructions on how to create your new Cookbook and get it hosted on the [Pythia Cookbook Gallery](https://cookbooks.projectpythia.org)!_
+
 This Project Pythia Cookbook covers ... (replace `...` with the main subject of your cookbook ... e.g., _working with radar data in Python_)
 
 ## Motivation