Add description and instructions

diff --git a/README.md b/README.md
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@@ -1 +1,24 @@
+tt
+==
+A more-unixy twtxt client.
+
+Doesn't force you to maintain a master "following" file (the way Twitter does),
+but let's you point it to any follow-file every time it runs.
+
+This means unlimited possibilities for ad-hoc, interesting filtering
+combinations. Especially when paired with
+[process substitution](https://en.wikipedia.org/wiki/Process_substitution).
+

 ![Screenshot](screenshot-multi.jpg)
 ![Screenshot](screenshot-multi.jpg)

+
+instructions
+------------
+
+### requirements
+[Racket](https://download.racket-lang.org/)
+
+### installation
+`make install` or `raco pkg install`
+
+### usage
+`tt (FOLLOW-FILE)`