Updates to plain-language.md

[natalialuzuriaga]

Is your feature request related to a problem? Please describe.
Currently,plain-language.md is just a list of links.

Describe the solution you'd like
We would like to add content from https://digital.gov/resources/plain-language-web-writing-tips/?dg to the existing plain-language.md doc.

[huda-code]

Hi @natalialuzuriaga,

I'd like to work on this issue. I'll review the Digital.gov guidance and draft updates to expand the existing plain-language.md beyond the current list of links.

Please let me know if there are any additional requirements or formatting preferences before I begin.