update readme

README.md

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 # discord-music-bot
 A small project to make a discord music bot for a private discord server.
-The bot has the commands play, join, leave, pause, resume, and stop.
-The bot's command prefix is "bt ".
+
+The program uses the discord, os, and youtube_dl libraries, and has dependencies on the pynacl library and ffmpeg.
+
+# commands
+The bot's commands use the prefix "bt ". The current commands are:
+
+  * play [youtube url] - Apply the join command, then play the audio of the youtube url
+  * join - Joins the voice channel of the user who invoked the command, otherwise joins the first voice channel it finds (if any)
+  * leave - Leaves the currently joined voice channel (if in a voice channel)
+  * pause - Pauses the music being played
+  * resume - Resumes music that has been paused
+  * stop - Stops the currently playing/paused music