Add API.md for bone meal API

mods/ITEMS/mcl_dye/API.md

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+# mcl_dye
+
+# Bone meal API
+Callback and particle functions.
+
+## mcl_dye.add_bone_meal_particle(pos, def)
+Spawns standard or custom bone meal particles.
+* `pos`: position, is ignored if you define def.minpos and def.maxpos
+* `def`: (optional) particle definition
+
+## mcl_dye.register_on_bone_meal_apply(function(pointed_thing, user))
+Called when the bone meal is applied anywhere.
+* `pointed_thing`: exact pointing location (see Minetest API), where the bone meal is applied
+* `user`: ObjectRef of the player who aplied the bone meal, can be nil!