Add license bits

data.lua

@@ -1,3 +1,25 @@
+--------------------------
+-- COPYRIGHT & LICENSE  --
+--------------------------
+
+-- Dectorio, a Factorio mod
+-- Copyright (c) 2017 James "PantherX" Panther
+
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation, either version 3 of the License, or
+-- (at your option) any later version.
+
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+
+-- A copy of the GNU General Public License is packaged along with
+-- this program.  You can also see <http://www.gnu.org/licenses/>.
+
+--------------------------
+
 --data.lua
 
 require("prototypes.entity.entities")

info.json

@@ -7,5 +7,6 @@
     "homepage": "https://github.com/jpanther/Dectorio",
     "factorio_version": "0.15",
     "dependencies": ["base >= 0.15"],
+    "license": "GNU GPLv3",
     "description": "Adds decorative elements to beautify your factory. Currently includes coloured signals, stone and concrete walls, wooden floorboards and painted concrete styles."
 }