JOSS paper

[znicholls]

Add JOSS paper

[znicholls]

@rgieseke can you take a look please? I think JOSS are now accepting papers again

[rgieseke]

Looks good to me!
I think i haven't contributed significantly during the model implementation, so i removed myself from the authors list.

Some comments/suggestions on the paper text below:

• maybe add a sentence describing the model assumptions of the two layers? It is described how it is extended but not really the initial fast/slow components
• add reference to RCMIP Phase 1 paper, where this implementation is used, this feeds also in the required "Statement of Need", as it was sort of a benchmark model for RCMIP
• has FaIR already implemented this (as alluded in last paragraph) https://github.com/OMS-NetZero/FAIR/blob/master/fair/temperature/geoffroy.py
  The point of FaIR not being modularised yet is probably a bit out of scope for the JOSS paper. The two sentences on FaIR could probably be condensed into one.
• last sentence, maybe just "used in research or education", "interested parties" is probably would use it for research or (self-)education
• make RCP, CMIP5, AOGCM uppercase in BibTex bibliography
• make tag "simple climate model" instead of "simple models"
• add tag "reduced complexity climate model"
• add tag "energy balance"

[znicholls]

Awesome thanks! Time to submit :)