Add documentation link to README.md (#121)

Author: hramezani

README.md

@@ -10,3 +10,6 @@ Settings management using Pydantic, this is the new official home of Pydantic's
 This package was kindly donated to the [Pydantic organisation](https://github.com/pydantic) by Daniel Daniels, see [pydantic/pydantic#4492](https://github.com/pydantic/pydantic/pull/4492) for discussion.
 
 For the old "Hipster-orgazmic tool to mange application settings" package, see [version 0.2.5](https://pypi.org/project/pydantic-settings/0.2.5/).
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+See [documentation](https://docs.pydantic.dev/latest/usage/pydantic_settings/) for more details.