Update README.md

README.md

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 Interactive jupyter notebook widget to calculate transmission zone plate grating (TZPG, also known as beam splitting off-axis zone plate) beam sizes and position at the sample and detector planes for the SCS instrument.
 
-![TZPGcalc widget](example/TZPGcalc.png "TZPGcalc widget")
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+![TZPGcalc widget](example/TZPGcalc.png "TZPGcalc widget")
+
+The so far implemented features are:
+*  calculates geometric beam propagation for diffracted beams by the grating (1st, -1st and 0th order)
+*  calculates geometric beam propagation for focused and unfocused beams by the off-axis zone plate (1st, 0th order)
+*  calculates beam sizes and position for 2 energies
+*  calculates sample position (membrane size and pitch) as well as etched facets
+*  calculates position of the DSSC module 15 as well as filter bar position
+*  calculates focal length change due to the KBS  
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