Add note to default configuration promoting the config gui.

src/main/resources/config.yml

@@ -1,3 +1,8 @@
+#
+# It is recommended that you use /configanvil to edit theses config.
+# You can still manually edit here if you like to. but if you do, don't forget to /anvilconfigreload after you changes !
+#
+
 # All anvil cost will be capped to limit_repair_value if enabled.
 #
 # In other words:

src/main/resources/enchant_conflict.yml

@@ -1,3 +1,8 @@
+#
+# It is recommended that you use /configanvil to edit theses config.
+# You can still manually edit here if you like to. but if you do, don't forget to /anvilconfigreload after you changes !
+#
+
 # material conflicts
 #
 # If you want to edit this file:

src/main/resources/item_groups.yml

@@ -1,3 +1,8 @@
+#
+# It is recommended that you use /configanvil to edit theses config.
+# You can still manually edit here if you like to. but if you do, don't forget to /anvilconfigreload after you changes !
+#
+
 # Please note this config use spigot material names.
 # It should match minecraft name in most case, maybe every case, but I can't be sure
 # In case there an issue with material name, you can found them here:

src/main/resources/unit_repair_item.yml

@@ -1,3 +1,8 @@
+#
+# It is recommended that you use /configanvil to edit theses config.
+# You can still manually edit here if you like to. but if you do, don't forget to /anvilconfigreload after you changes !
+#
+
 # Unit repair configuration
 #
 # This configuration is to make custom unit repair