Add farming mod

mods/default/nodes.lua

mods/farming/README.txt

mods/farming/depends.txt

mods/farming/init.lua

mods/farming/textures/farming_bread.png

mods/farming/textures/farming_cotton_1.png

mods/farming/textures/farming_cotton_2.png

mods/farming/textures/farming_cotton_3.png

mods/farming/textures/farming_cotton_4.png

mods/farming/textures/farming_cotton_5.png

mods/farming/textures/farming_cotton_6.png

mods/farming/textures/farming_cotton_7.png

mods/farming/textures/farming_cotton_8.png

mods/farming/textures/farming_cotton_seed.png

mods/farming/textures/farming_flour.png

mods/farming/textures/farming_soil.png

mods/farming/textures/farming_soil_wet.png

mods/farming/textures/farming_soil_wet_side.png

mods/farming/textures/farming_string.png

mods/farming/textures/farming_tool_bronzehoe.png