Update README.md

Added notes for notebooks.

notebooks/README.md

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-Put notebooks in here
+## Notebooks for analysis and modelling
+This folder contains notebooks for analysis and modelling of the COVID-19 data. Some use the data in the repo, some fetch data from external data. 
+
+## Current notebooks
+* Growth of South Africa vs. Some of the world [[Notebook]](https://github.com/dsfsi/covid19za/blob/master/notebooks/2020-03-28-international-growth-analysis.ipynb)
+![](https://github.com/dsfsi/covid19za/blob/master/visualisation/covid-growth-countries.png?raw=true)
+* Growth of South Africa Provinces [[Notebook]](https://github.com/dsfsi/covid19za/blob/master/notebooks/covid19_growth_for_sa.ipynb)
+![](https://github.com/dsfsi/covid19za/blob/master/visualisation/per_province_growth_first_report.png?raw=true)
+## Where do I start?
+### Running the notebooks
+You can pull the repo and then run the notebooks and make adjustments as I need. 
+
+### Getting ideas
+See the great resource from fastai on different analysis and modelling notebooks. [URL](https://covid19dashboards.com/)
+
+### TODO
+Have simple link to mybinder for all notebooks