Add link to cloud-native geo guide (#140)

Author: jsignell

external-resources.qmd

@@ -16,6 +16,7 @@ This list is intended for scientists who want to get started with cloud-based, c
 * [Geographic data book - emphasis on vector data](https://geographicdata.science/book/intro.html)
 
 ## Look through nicely curated lists of tools and resources
+* [Cloud-Optimized Geospatial Formats Guide](https://guide.cloudnativegeo.org/)
 * [NASA Openscapes Earthdata Cloud Cookbook](https://nasa-openscapes.github.io/earthdata-cloud-cookbook/)
 * [CryoCloud JupyterBook](https://book.cryointhecloud.com/)
 * [Project Pythia - Pangeo's education hub](https://projectpythia.org/)