Create PREPARATION.md

PREPARATION.md

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+Please install both R and Python before, the instructions are here: https://github.com/jgarciab/NetworkScience/tree/main/Installation. We will be gentle with programming, but try to get a bit used to both programming languages before the summer school:
+- R for Python users:
+	- Short intro: https://medium.com/@nawazahmad20/r-for-python-programmers-part-1-ca4eab668b8c
+	- An in-depth guide (check the "Explore" section): https://r4ds.had.co.nz/
+- Python for R users
+	- Short intro: https://richardson.byu.edu/624/lpython/PythonforRusers.pdf 
+	- https://towardsdatascience.com/the-struggles-i-had-when-switching-from-r-to-python-baca0139b01b
+	- A more complete guide: https://github.com/MangoTheCat/python-for-r-users-workshop
+	- Even more info: https://github.com/jgarciab/wwd2019
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+Make sure your installation works using these instructions:
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