Refine the documentation.

Signed-off-by: Sav S. Mach <sav@loophole.cc>

Author: Sav S. Mach

README.md

@@ -1,14 +1,29 @@
-# brainz
-A collection of scripts to deal with ListenBrainz data.
+# Brainz
+
+A simple script to search and delete [ListenBrainz](https://listenbrainz.org) listens.
 
 ## Installation
 
+```
 go install github.com/sav/brainz@latest
+```
 
-## Build
+## Usage
 
-go build
+First define `BRAINZ_TOKEN` environment with an API Token from [ListenBrainz](https://listenbrainz.org) website:
 
-## Usage
+```
+export BRAINZ_TOKEN=<token>
+```
+
+### Searching
+
+```
+./brainz -l -u <user> -s <regexp>
+```
+
+### Deleting
 
-./brainz -l -u sav10sena -s '.*'
+```
+./brainz -d -u <user> -s <regexp>
+```