[Open Assets] Custom Enemy Guide

this is very helpful for beginners to get started with making enemies!! i have some suggestions though.
1. not all of those arguments in the definition are necessary! mainly those that are null or sfx_none or whatever. those can be safely omitted, making the definition less confusing!
2. explain how to define map editor keys. so that the enemy has a name, sprite, category and stuff when viewed in the map editor!
3. give links to useful resources on the Wiki!

It’s a helpful guide, explains the basics of not just enemy making, but objects as well. I can’t wait for all of the new crawla types I am going to make!