Add a README and a TODO

README.md

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+CheckLib: A simple wrapper to make implementing Nagios/Icinga checks in Python
+simple
+===
+
+TODO: Write a reasonable Readme :-)
+
+Documentation
+---
+
+Probably only as a part of source code. Currently it is short and aimed
+at Python developers anyway.
+
+The primary target are plugins for Icinga 2.
+
+Documentation of plugin API is at TODO and TODO.
+
+Project goals (and non-goals)
+----
+
+The aim is to make writing _simple_ Python checks _really_ easy, and also to be
+lightweight. Therefore, only basic and common features will likely be
+implemented. (And last but not least, it mainly depends on my time :-))
+
+If you need a fully-featured library, feel free to use
+[Nagiosplugin](https://pypi.org/project/nagiosplugin/).
+
+I would like to keep this as a pure vanilla Python code. It lowers the barrier
+to code inspection and contribution and does not add dependencies, so that this
+can be used in very limited environments.
+
+The exact scope is currently not rigorously defined, feel free to contact me
+if you are not sure.
+
+Bugs, feedback, ideas, patches, contact &c.
+-----
+Please send anything you have on your mind to
+[checklib@pokemon.ledoian.cz](mailto:checklib@pokemon.ledoian.cz).
+
+I currently want to know if anyone else has tried to use the code :-)
+
+(For patches you can use `git send-email` (TODO link to Drew DeVault's site))
+
+Licence
+----
+
+Currently the code is just dumb implementation of the plugin spec,
+so there is little creative value. So WTFPL it is for now. (I might decide to
+change it later. Also, if any contributor comes by, they can steer the
+direction. I want to keep this as Free Software, though)[^Wrote me when this
+project was marked as private :-)]
+
+(TODO: Proper licencing, maybe even SPDX info)

TODO

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+Needed features:
+- Ranges
+- Timeouts
+- Basic usage
+- Packaging
+	- Debian
+	- Arch
+
+Nice-to-have:
+- Performance data
+- Type annotations
+
+Little things:
+- editorconfig