expand readme

readme.md

@@ -9,3 +9,14 @@ Some of the bit-twiddling it did to make it really, really fast apparently also
 I'd try and fork it, but I'm not much of a C developer. But I do know go, and [gitlab.com/cznic/tk9.0](https://gitlab.com/cznic/tk9.0) is a really interesting approach to UI toolkits in go that I've been wanting to try out.
 
 So, what comes before Z? Y.
+
+This is being created to scratch an itch for me and only me.
+
+## TODO
+
+* image resizing
+* file sorting options
+* display a list of filenames
+* skip file load if direction key is repeated
+* cache loaded files for quick back-and-forth
+* preload next file for performance