feat(cli): add datadir cmd

Because I'm tired of trying to find this stupid directory in
explorer.exe all the time.

docs/cli/data-directory.md

@@ -0,0 +1,12 @@
+# data-directory
+
+```
+Show the path to komorebi's data directory in %LOCALAPPDATA%
+
+Usage: komorebic.exe data-directory
+
+Options:
+  -h, --help
+          Print help
+
+```