Update README.md

Author: alahiff

notebooks/README.md

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 # Colab notebooks
+
+## Using Simvue in Google Colab
+
+This demonstrates how to use Simvue in Google Colab.
+
+## Simple Tensorflow example
+
+[![Open In Collab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/drive/1HDN0gUKC9pGtroOQhylrH_eM6BnIvcRC?usp=sharing)
+
+In this example we take an existing Python code and then make use of Simvue to:
+* collect metadata,
+* collect metrics which can be visualised in real time in the Simvue dashboard.