Added Pie's Guide to KubeJS

[Hunter19823]

This series of tutorial guides are aimed at both technical and beginner individuals.
I wanted to put down my understanding of how KubeJS works today, and provide an in-depth explanation on how to use various tools when making scripts.

[KonSola5]

Cool! But technically the things in JavaScript objects aren't referred to as "fields", they are referred to more as "properties".

From https://rhino.github.io/tutorials/scripting_java/:

Rhino provides another convenience by allowing properties of JavaBeans to be accessed directly by their property names. A JavaBean property foo is defined by the methods getFoo and setFoo. Additionally, a boolean property of the same name can be defined by an isFoo method. For example, the following code actually calls the File object’s getName and isDirectory methods.

js> f.name
test.txt
js> f.directory
false

[KonSola5]

Is this ready?
If not - please make this PR a draft.