add readme to notebooks folder

jupyter-notebooks/README.md

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+# Planet Jupyter Notebooks Examples
+
+This folder contains a collection Jupyter notebooks that teach you how to use Planet Insights Platform. They are divided into three sections:
+
+1. `api_guides` - Here, you will find notebooks that introduce you to the essential functionality of different APIs with quickstarts to guides focused on specific functionality. 
+2. `use_cases` - In the use cases section, we've built notebooks around common applications of satellite data to demonstrate how to answer questions or create insights from Earth observation data. Use cases are typically 
+3. `workflows` - Here we cover foundational workflows of how to use Planet Insights Platform as well as common patterns of analyzing, processing, or integrating data with other software. Workflows are typically buidling blocks that you might use to accomplish different tasks you are working on.