Update index.md

Author: jason-fox

docs/index.md

@@ -22,6 +22,8 @@ This is a collection of **NGSI-v2** tutorials for the FIWARE system. Each tutori
 demonstrate the correct use of individual FIWARE components and shows the flow of context data within a simple Smart
 Solution either by connecting to a series of dummy IoT devices or manipulating the context directly or programmatically.
 
+[![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://github.com/codespaces/new?template_repository=FIWARE/tutorials.NGSI-v2)
+
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