Add README

Author: gjbex

README.md

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+# Python for data science
+
+GitHub repository for participants of the "Python for data science" training.
+For information on the training, see the website
+[https://gjbex.github.io/Python-for-data-science/](https://gjbex.github.io/Python-for-data-science/)
+
+
+## What is it?
+
+1. [`python_for_data_science.pptx`](python_for_data_science.pptx): PowerPoint
+   presentation used for the training.
+1. [`source-code`](source-code): directory that contains sample code written to
+   develop the slides and illustrate concepts.
+1. [License](LICENSE): license information for the material in this repository.
+1. [Contributing](CONTRIBUTING.md): information on how to contribute to this
+   repository.
+1. docs: directory containing the website for this repository.