Put notes somewhere useful

design-notes.md

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+Random TODOs as I think of them:
+
+ - Whilst the `Expansions` bit on `plugins` is a lovely surprise, I find myself
+   having to run the regexp twice because the callback does not give me any
+   captured groups (just the matched string). I run it once so the callback
+   fires, then run it again to actually extract the useful bits. This could
+   be done better.
+
+ - I'm not sure about the `Plugin(roomId string)` interface function. Python
+   NEB could be configured to allow certain actions in certain rooms (e.g. only
+   expand issues in this room, not that room). You can for sure do that using
+   the given interface function, but you'd need to store those mappings
+   yourself. Python NEB did it by giving you a key-value store which you could
+   chuck config info for a room into: I wonder how useful that would be for
+   Go-NEB?