docs: update README.md

[athith-g]

Updates readme provide a full picture of the middleware.

Summary by Sourcery

Update the README to provide a detailed explanation of the middleware's functionality, implementation, and security considerations, along with updated installation and testing instructions.

Documentation:

• Expand the README to provide a comprehensive overview of the middleware, including its purpose, implementation details, and important considerations for use.
• Add sections on middleware functionality, decryption process, and security considerations, emphasizing the need for a Trusted Execution Environment.
• Include installation instructions using Poetry and update testing requirements and instructions.
• Enhance the contributing section with guidelines and a code of conduct link.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request updates the README.md file to provide a more comprehensive overview of the middleware, including implementation details, important considerations, and visual aids. The changes focus on improving the documentation and clarity of the project.

File-Level Changes

Change	Details	Files
Expanded project description and implementation details	Added a more detailed description of the middleware's purpose Included information about the decryption executor and volume Added explanations of how the middleware alters TES requests Included a section on the decryption process	README.md
Added visual aids to explain the middleware's functionality	Included a request diagram to illustrate how the middleware modifies TES requests Added a workflow diagram to show the decryption process	README.md
Updated installation and testing instructions	Changed installation instructions to use Poetry Updated testing requirements and instructions Removed outdated prerequisites section	README.md
Added important considerations for usage	Included a warning about using the middleware in untrusted environments Mentioned the need for a Trusted Execution Environment (TEE)	README.md
Updated project metadata and links	Added contributing guidelines and code of conduct links Included logos for GA4GH, ELIXIR, and ELIXIR Cloud & AAI Updated and added new reference links	README.md

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[sourcery-ai]

Hey @athith-g - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟡 Documentation: 2 issues found

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[uniqueg]

Some minor typos/issues - otherwise this is an absolutely exemplary doc page!!