add license file for scientific colour maps

Author: nicolaspayette

gui/src/main/resources/palettes/LICENCE.pdf

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+# Scientific colour maps
+
+Colour maps stored in this directory and used in POSEIDON were developed by Fabio Crameri:
+
+- Crameri, F. (2018a), Scientific colour maps. Zenodo. [http:// doi.org/10.5281/zenodo.1243862]()
+
+- Crameri, F., G.E. Shephard, and P.J. Heron (2020), The misuse of colour in science communication, Nature Communications, 11, 5444. [doi: 10.1038/s41467-020-19160-7]()
+
+See the LICENSE.pdf file.