message: manual: Add documentation for colors
diff: @@ -36,6 +36,10 @@ Attributes for the command line are also available:
  - reverse
  - underlined
  +You can also access the full 256 colors using hex or decimal representation. For example ${c::F} accesses the 16nth color, ${c::0xFF} the 255th, and ${c::14} would use color #14.
  +
  +Lastly, you can use true colors using hexes. ${c::0x000000} and ${c::0x000} would print pure black independent of the terminal's color scheme. It should be advised to avoid using those colors except specific use cases where the exact color is required.
  +
  ### Example
  ```
  fn PROMPT
  