Update README.md

Author: dlebauer

README.md

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 # Tutorials
 
 Learn to use TERRA REF data and software
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+Note that many of these tutorials have complex dependencies. These can be launched from within the [TERRA REF Sensor Data Portal](https://terraref.ncsa.illinois.edu) (requires account / access). 
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+Also try:
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+* mybinder.org/repo/terraref/rstudio (for R tutorials under traits/)
+* mybinder.org/repo/terraref/rstudio-geospatial (for R tutorials under sensors/)
+* mybinder.org/repo/terraref/jupyter-plantcv (for PlantCV tutorial)
+* mybinder.org/repo/terraref/jupyter-netcdf (Python tutorials under sensors/)
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+
 ## Links
 
 to quick-start documentation, README's, code for learning and applied examples
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+### Slides
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+* [Project Overview](https://docs.google.com/presentation/d/1MVOGt2xKgCfeUdVF9tWyyWrcPPfSg9DQvxHWQ0nN44U/pub?start=false&loop=false&delayms=3000)
+* [Data Access Workshop](https://docs.google.com/presentation/d/1YikA_h9LIgTJkuNrAublpWIoT2pRF-E-RI1k1UlqeAE/pub?start=false&loop=false&delayms=3000)