Color Library: Rainbow Index & Simplest Return Color

Library "Color Library!"
To help with large projects that need colors!
If you guys make the library bigger, share it so we can all have tons of colors!

2 Functions
Uppercase and Lowercase, because why not?
import library as color
1.) color.this("Brown") // or color.this("brown") both work
2.) color.rainbow(1) //Returns first index of Rainbow

this(x)
  TODO: color.this(Brown)
  Parameters:
    x: TODO: String Color Name
  Returns: TODO: Color

rainbow(x)
  TODO: Return Rainbow Index
  Parameters:
    x: TODO: Number is index of Rainbow :)
  Returns: TODO: Color

Versionsinformation:

v2
Constant Vs Series mismatch
Updated:
this(x)
  TODO: color.this(Brown)
  Parameters:
    x: TODO: String Color Name
  Returns: TODO: Color

rainbow(x)
  TODO: Return Rainbow Index
  Parameters:
    x: TODO: Number is index of Rainbow :)
  Returns: TODO: Color