added lisence gradle plugin, thanks @kashike

Author: AbrarSyed

HEADER

@@ -0,0 +1,17 @@
+${description}
+Copyright (C) ${year} ${fullname}
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library 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
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
+USA

build.gradle

@@ -6,6 +6,7 @@ buildscript {
     }
     dependencies {
         classpath "com.gradle.publish:plugin-publish-plugin:0.9.1"
+        classpath 'nl.javadude.gradle.plugins:license-gradle-plugin:0.11.0'
     }
 }
 
@@ -14,6 +15,7 @@ apply plugin: 'idea'
 apply plugin: 'eclipse'
 apply plugin: 'maven'
 apply plugin: "com.gradle.plugin-publish"
+apply plugin: 'license'
 
 group = 'net.minecraftforge.gradle'
 version = '2.0-SNAPSHOT'
@@ -158,6 +160,27 @@ test {
         exclude "**/ExtensionMcpMappingTest*"
 }
 
+license {
+    ext {
+        description = 'A Gradle plugin for the creation of Minecraft mods and MinecraftForge plugins.'
+        year = '2013'
+        fullname = 'Minecraft Forge'
+    }
+    header rootProject.file('HEADER')
+    include '**net/minecraftforge/gradle/**/*.java'
+    excludes ([
+        '**net/minecraftforge/gradle/util/ZipFileTree.java',
+        '**net/minecraftforge/gradle/util/json/version/*',
+        '**net/minecraftforge/gradle/util/patching/Base64.java',
+        '**net/minecraftforge/gradle/util/patching/ContextualPatch.java'
+    ])
+    ignoreFailures false
+    strictCheck true
+    mapping {
+        java = 'SLASHSTAR_STYLE'
+    }
+}
+
 pluginBundle {
     website = 'http://www.gradle.org/'
     vcsUrl = 'https://github.com/MinecraftForge/ForgeGradle'