Add new recipe (19) as started by summer student: per-season trends #821
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A recipe I constructed based on the beginnings of a recipe produced by our second summer student, George. I decided it would be good to go on from his basis to show how simple it is for cf-python to calculate seasonal trends and to plot them with cf-plot, which is a bit different to anything shown in the existing recipes, as far as I have seen.
Expected output