Update README.md

Author: ljyloo

README.md

@@ -5,6 +5,8 @@ Map converter for Minecraft:Pocket Edition, from format "LevelDB" to "Anvil".
 
 This program uses leveldb by tinfoiled. See lisense here https://github.com/tinfoiled/leveldb
 
+This program contains code from Mojang:Source at https://mojang.com/2012/02/new-minecraft-map-format-anvil/
+
 Usage:
 
 java -jar Converter.jar \<import folder\> \<export folder\>