docs: Add shade creds docs

[popoveugene]

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[github-actions]

Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

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I have read the CLA Document and I hereby sign the CLA

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5 out of 6 committers have signed the CLA.
✅ (popoveugene)[https://github.com/popoveugene]
✅ (AlexandraMik)[https://github.com/AlexandraMik]
✅ (tesmarishy)[https://github.com/tesmarishy]
✅ (chethana-shastry-p)[https://github.com/chethana-shastry-p]
✅ (BackendBits)[https://github.com/BackendBits]
❌ @Tesma Jose
Tesma Jose seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}