Updated README with more info.

README.md

@@ -4,12 +4,37 @@ RPG helper bot for Telegram
 Commands:
 
   - /newgame `<name>`
+
+Creates a new game by that name. The current group is automatically joined. The user that creates a game becomes the game master.
+
   - /delgame
+
+Ends the game in the current group. Must be a game master.
+
   - /showgame
-  - /roll
+
+Show game statistics (name, players, etc.)
+
   - /player `<name>`
-  - /update `<container>` `<item>` `<value>`
-  - /add `<container>` `<item>` `<change>`
-  - /del `<container>` `<item>`
+
+Join the game as a player, with the given character name (or update your characters name).
+
+  - /roll `[<dice>]`
+
+Roll dices. Defaults to 4dF. 
+
   - /show
 
+Shows your character sheet and inventory contents.
+
+  - /add `<container>` `<item>` `<value>`
+
+Adds an item to your character sheet or inventory. If the item does not exist, it is created. "Change" can be a text string, a number, or a relative change (i.e. if "value" has a plus or minus sign, like "+1" or "-1", the item value is changed by the specified amount).
+
+  - /update `<container>` `<item>` `<value>`
+
+Similar to /add, but does not create an object if it does not already exist.
+
+  - /del `<container>` `<item>`
+
+Delete an item (or a character sheet entry).