Add link to docs

[shirk3y]

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CLA

• [X] I have signed the Adobe CLA (required).

Topic

This is a pull request for:

• [X ] A guide contained within this repo.
• [ ] A sample contained within this repo.
• [ ] Something new that I have already discussed with Adobe in a GitHub issue. Issue link:

Versions

• [ ] XD version(s) tested :
• [ ] Tested XD version(s):

Description of the pull request

A link to docs is something I was trying to find when I came here.