docs: Add developer info

README.md

@@ -164,6 +164,23 @@ default-formatter = jinja2
 Can be any of the installed papis formatters, including custom ones
 (though usually it will be `python`, which is also the default setting).
 
+## For developers
+
+To get started hacking on this little plugin it is easiest to either inject papis into the development environment:
+
+```sh
+uv add --dev papis
+```
+
+Or, what I do, in turn inject it into your normal papis environment as editable: (`uv tool install --with-editable path/to/this/repo papis`).
+
+Currently I can see two big things to do that would help this project out:
+
+- A way to encode the options directly in the `ref-format` string, such as `ref-format = bbt:Author[1]year[2]TITLE[2, 20]` or something.
+- Tests for all the little regex-y things we do. Tests for extracting the author, formatting the title, taking apart dates, and so on.
+
+If you have the motivation to work on one of these let me know!
+
 ---
 
 This plugin is a fairly simple adaption from [this](https://github.com/hrdl-github/papis/commit/b9b9c6eaa3de159e1b210174ef49e90a89271eb8) commit,