impr: documentation and annotation

src/main/java/com/slampvp/factory/command/Command.java

@@ -2,16 +2,48 @@
 
 import com.slampvp.factory.player.Rank;
 
+import java.lang.annotation.ElementType;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
 
+/**
+ * The Command annotation is used to provide metadata for command methods.
+ * It includes a description of the command, its usage, the minimum rank required
+ * to execute the command, and whether the command can only be executed by players.
+ *
+ * @see com.slampvp.factory.player.Rank
+ */
 @Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
 public @interface Command {
+
+    /**
+     * A brief description of what the command does.
+     *
+     * @return the description of the command
+     */
     String description();
 
+    /**
+     * A string explaining how to use the command.
+     *
+     * @return the usage syntax of the command
+     */
     String usage();
 
+    /**
+     * The minimum rank required to execute the command.
+     *
+     * @return the minimum rank required to execute the command
+     */
     Rank minimumRank();
 
+    /**
+     * A flag indicating whether the command can only be executed by players
+     * (as opposed to console or other entities).
+     *
+     * @return true if the command can only be executed by players, false otherwise
+     */
     boolean playerOnly();
-}
+}