Updates README and TODO

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 # Finder: CLI searcher and browser REPL
 
+## About
+
+Finder is a terminal-based searcher.
+
+It's like [ranger][], but with a search-like interface.
+
+It aims to replace the fatigue of frequently using [find][] + [grep][]
+combinations for finding files, but it's also intended for searching and
+browser other contents such as file lists, spreadsheets and remote queries.
+
+[ranger]: https://ranger.github.io
+[find]: https://en.wikipedia.org/wiki/Find_(Unix)
+[grep]: https://en.wikipedia.org/wiki/Grep
+
 ## Dependencies
 
 * [Python][] 3+.