Update README with assignment preview links

Added links for assignment preview and solution access.

Author: Tom-van-Woudenberg

README.md

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 # Workshop 1.5: To Starve or Not to Starve
 
+You can preview this assignment on https://mude.citg.tudelft.nl/workbook-2025/assignments/WS1.5/README.html. After the deadline, this link will include solutions. The preview of the assignment version is shared here: https://mude.citg.tudelft.nl/workbook-2025/no_solutions/assignments/WS1.5/README.html. Pages can be downloaded as `.md` and `.ipynb` files to your computer.
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 In this workshop, you will work with data on water quality of offshore waters, namely the concetration of nitrogen (DIN) and the concentration of phosphorus (DIP). As you probably know, these variables are nutrients which are key for the growth of species of algae and molluscs that feed on them. In order to guarantee the survival of these species, a minimum amount of nutrients in the water is needed so they do not starve.
 You will first calculate the covariance and correlation between the two variables, and then their joint probabilities. You will then use this to find out if your hypothetical patch of water has a sufficient level of DIN and DIP for our aquatic friends!