Updating readme with assumerole JFrog architecture & deployment

[oumkale]

• All tests passed. If this feature is not already covered by the tests, I added new tests.
• This pull request is on the main branch.
• I used gofmt for formatting the code before submitting the pull request.

---

[github-actions]

CLA Assistant Lite bot:
Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you 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.

---

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

---

_{You can retrigger this bot by commenting recheck in this Pull Request}