docs: example for @charset @import and @namespace

[RobertAron]

Corresponding issue (if exists):

#1268

What would you like to add/fix?

Some basic info in the docs.

Todo

• Add tests if possible
• Add changelog if users should know about the change
• Add documentation

Let me know if you'd like it to be written in a different way. I tried to keep it as straight forward as possible.

[kof]

thanks