update readme

readme.md

@@ -12,15 +12,23 @@ So, what comes before Z? Y.
 
 This is being created to scratch an itch for me and only me.
 
-## Image credit
+## Building it yourself
+
+`make why` will generate a raw go binary.
+
+`make why.app` will generate a Mac app bundle for convenient installation to your `/Applications` folder.
+
+## Logo image credit
 
 Generated via <https://gopherize.me/gopher/ab6a409adff6140f25080835e82384f25bfe15c5>. Renee French designed the original Gopher; see <https://go.dev/blog/gopher> for his history.
 
 ## TODO
 
-[ ] image resizing
-[ ] file sorting options
-[x] display a list of filenames
+[ ] folder sorting options
 [ ] skip file load if direction key is repeated
 [ ] cache loaded files for quick back-and-forth
 [ ] preload next file for performance
+[ ] image resizing (maybe)
+[ ] cbz/cbr support?
+[x] build functional mac .app bundle with file-type registration and Open With... handling
+[x] display a list of filenames