Update README.md

Author: gbraad

README.md

@@ -6,8 +6,10 @@ Gerard Braad's notebooks
 
 A collection of notebooks for use with Jupyter or VSCode
 
+## Usage
 
-[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/gbraad/notebooks)
+  * Open in [Gitpod workspace](https://gitpod.io/#https://github.com/gbraad/notebooks)
+  * Open in [GitHub codespaces](https://github.com/codespaces/new?hide_repo_select=true&ref=master&repo=62899409)
 
 
 ## Contens