Add source files for JOSS paper submission

paper.bib

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+
+@article{Jeevanjee:2017a,
+	Author = {Nadir Jeevanjee and Pedram Hassanzadeh and Spencer A. Hill and Aditi Sheshadri},
+	Doi = {10.1002/2017MS001038},
+	Journal = {J. Adv. Model. Earth Syst.},
+	Pages = {1760--1771},
+	Title = {A perspective on climate model hierarchies},
+	Volume = {9},
+	Year = {2017},
+}
+
+@article{Held:2005fk,
+	Author = {Isaac M. Held},
+	Journal = {Bull. Amer. Meteor. Soc.},
+	Number = {11},
+	Pages = {1609--1614},
+	Title = {The Gap between Simulation and Understanding in Climate Modeling},
+	Volume = {86},
+	Year = {2005},
+}

paper.md

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+---
+title: 'CLIMLAB: a Python toolkit for interactive, process-oriented climate modeling'
+tags:
+- climate
+authors:
+- name: Brian E. J. Rose
+  orcid: 0000-0002-9961-3821
+  affiliation: 1 # (Multiple affiliations must be quoted)
+date: 22 March 2018
+bibliography: paper.bib
+---
+
+# Summary
+
+CLIMLAB is a Python-based software toolkit for interactive, process-oriented climate modeling for use in education and research. It is motivated by the need for simpler tools and more reproducible workflows with which to "fill in the gaps" between blackboard-level theory and the results of comprehensive climate models. With CLIMLAB you can interactively mix and match physical model components, or combine simpler process models together into a more comprehensive model. CLIMLAB in the classroom to put models in the hands of students (undergraduate and graduate), and emphasize a hierarchical, process-oriented approach to understanding the key emergent properties of the climate system. CLIMLAB is equally a tool for climate research, where the same needs exist for more robust, process- based understanding and reproducible computational results.
+
+- A summary describing the high-level functionality and purpose of the software
+for a diverse, non-specialist audience
+- A clear statement of need that illustrates the purpose of the software
+- A list of key references including a link to the software archive
+- Mentions (if applicable) of any ongoing research projects using the software
+or recent scholarly publications enabled by it
+
+Citations to entries in paper.bib should be in
+[rMarkdown](http://rmarkdown.rstudio.com/authoring_bibliographies_and_citations.html)
+format.
+
+This is an example citation [@Jeevanjee:2017a]. And [@Held:2005fk].
+
+
+# References