Create CODESHELTER.md

CODESHELTER.md

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+# Note to Code Shelter maintainers
+
+I took over this project in 2018 to get it back on its feet becasue the original
+developer abandoned it, and time had rendered it inoperable. It has since come to be
+used by a large number of people who needed Firebase access in their Python projects.
+I don't have as much time as I'd like to dedicate to this project these days, 
+and I'd appreciate some help with maintaining it. I will generally be available 
+to consult and maybe develop the occasional bugfix, but beyond that you're on your own.
+
+It would be great if you could help out with issue triage, fixing bugs and
+occasionally developing new features that you think are necessary. The project
+is mainly feature-complete, and stable, so I don't expect any major redevelopment.
+I would appreciate being consulted before making any drastic changes, but other than
+that, you have free reign.
+
+I have already added Code Shelter to the project's PyPI page, so feel free to
+make any releases necessary.
+
+Thanks,
+
+Nick