add some docs

README.md

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+Simple planet like planet venus but in rust and maintained.
+
+Please see the rustdoc of main.rs for further information.
+
+## todo
+
+* use a nice lib to process the config file
+  * should check whether dirs exists and are writeable
+  * should check whether feed urls can be parsed
+
+## Credits
+
+While writing this, I read and also copied code from:
+
+* [agro](https://docs.rs/crate/agro/0.1.1)
+* [hades](https://github.com/kitallis/hades)
+* [planetrs](https://github.com/djc/planetrs)