Make help command use descriptions and usages

src/main/java/wtf/beatrice/hidekobot/commands/message/DiceRollCommand.java

@@ -30,6 +30,23 @@ public class DiceRollCommand implements MessageCommand
         return false;
     }
 
+    @NotNull
+    @Override
+    public String getDescription() {
+        return "Roll dice. You can roll multiple dice at the same time." +
+                "\nExamples:" +
+                "\n - `d8 10` to roll an 8-sided die 10 times." +
+                "\n - `d12 3 d5 10` to roll a 12-sided die 3 times, and then a 5-sided die 10 times." +
+                "\n - `30` to roll a standard 6-sided die 30 times." +
+                "\n - `d10` to roll a 10-sided die once.";
+    }
+
+    @Nullable
+    @Override
+    public String getUsage() {
+        return "[dice size] [rolls]";
+    }
+
     @NotNull
     @Override
     public CommandCategory getCategory() {