added the readme data in the file

[ibilalkayy]

• [x] Have you followed the guidelines for contributing?
• [x] Have you signed the CLA?
• [x] Have you successfully run tox?

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I have added the README file for the Craft Archives Python package. The README provides an overview of the package, its features, installation instructions, and usage examples.

It aims to simplify software archive management within the Craft Parts framework, offering convenient interfaces for defining archive locations, installing packages, and verifying package integrity.

[tigarmo]

Closing this due to lack of response.