📝 Add initial version of README.md, CONTRIBUTING.md, release-notes.md, SECURITY.md

Author: tiangolo

CONTRIBUTING.md

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+# Contributing

README.md

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-# fastapi-cli
+# FastAPI CLI
+
+<a href="https://github.com/tiangolo/fastapi-cli/actions?query=workflow%3ATest" target="_blank">
+    <img src="https://github.com/tiangolo/fastapi-cli/workflows/Test/badge.svg" alt="Test">
+</a>
+<a href="https://github.com/tiangolo/fastapi-cli/actions?query=workflow%3APublish" target="_blank">
+    <img src="https://github.com/tiangolo/fastapi-cli/workflows/Publish/badge.svg" alt="Publish">
+</a>
+<a href="https://coverage-badge.samuelcolvin.workers.dev/redirect/tiangolo/fastapi-cli" target="_blank">
+    <img src="https://coverage-badge.samuelcolvin.workers.dev/tiangolo/fastapi-cli.svg" alt="Coverage">
+<a href="https://pypi.org/project/fastapi-cli" target="_blank">
+    <img src="https://img.shields.io/pypi/v/fastapi-cli?color=%2334D058&label=pypi%20package" alt="Package version">
+</a>
+
+---
+
+**Source Code**: <a href="https://github.com/tiangolo/fastapi-cli" target="_blank">https://github.com/tiangolo/fastapi-cli</a>
+
+---
+
+Run FastAPI applications from the command line with FastAPI CLI. 🚀
+
+## License
+
+This project is licensed under the terms of the MIT license.

SECURITY.md

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+# Security Policy
+
+Security is very important for FastAPI and its community. 🔒
+
+Learn more about it below. 👇
+
+## Versions
+
+The latest versions of FastAPI and FastAPI CLI are supported.
+
+You are encouraged to write tests for your application and update your FastAPI and FastAPI CLI version frequently after ensuring that your tests are passing. This way you will benefit from the latest features, bug fixes, and **security fixes**.
+
+## Reporting a Vulnerability
+
+If you think you found a vulnerability, and even if you are not sure about it, please report it right away by sending an email to: [email protected]. Please try to be as explicit as possible, describing all the steps and example code to reproduce the security issue.
+
+I (the author, [@tiangolo](https://twitter.com/tiangolo)) will review it thoroughly and get back to you.
+
+## Public Discussions
+
+Please restrain from publicly discussing a potential security vulnerability. 🙊
+
+It's better to discuss privately and try to find a solution first, to limit the potential impact as much as possible.
+
+---
+
+Thanks for your help!
+
+The FastAPI community and I thank you for that. 🙇

release-notes.md

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+# Release Notes
+
+## Latest Changes