started adding command template

src/com/sekwah/advancedportals/core/api/commands/SubCommand.java

@@ -5,7 +5,7 @@ import com.sekwah.advancedportals.coreconnector.container.CommandSenderContainer
 import java.util.List;
 
 /**
- * Subcommand that can be registered to parts.
+ * Subcommand that can be registered under e.g. /portal show or /portal edit
  *
  * @author sekwah41
  */

src/com/sekwah/advancedportals/core/commands/CommandTemplate.java

@@ -0,0 +1,18 @@
+package com.sekwah.advancedportals.core.commands;
+
+import com.sun.corba.se.impl.activation.CommandHandler;
+
+import java.util.List;
+
+/**
+ * Already know spigot's auto complete possibilities
+ *
+ * Sponge https://docs.spongepowered.org/stable/en/plugin/commands/arguments.html#custom-command-elements
+ */
+public interface CommandTemplate {
+
+    void onCommand(CommandHandler sender, String[] args);
+
+    List<String> onTabComplete(CommandHandler sender, String[] args);
+
+}