Update docs with CSI mode and installation

[mattbates]

Adds the CSI mode and also note how to install a SPIFFE provider

[gemini-code-assist]

Summary of Changes

Hello @mattbates, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the README.md documentation for spiffe-enable. The primary goal is to introduce and explain the new CSI mode for SPIFFE injection and to provide more comprehensive guidance on the installation process, particularly in relation to SPIFFE identity providers.

Highlights

• Documentation Refinement: I've updated the introductory description of spiffe-enable to clarify its purpose, the environment it operates within (including cofidectl), and the specific type of credentials it helps manage (SVID credentials).
• CSI Mode Integration: A new csi mode has been added to the documentation, detailing how a SPIFFE CSI volume is injected and the SPIFFE_ENDPOINT_SOCKET environment variable is set for workloads. This provides clear guidance on leveraging SPIFFE CSI.
• Enhanced Installation Guidance: The installation section now provides more context on how spiffe-enable integrates with SPIFFE-compliant workload identity providers. It recommends cofidectl for enabling SPIFFE in a cluster, while reaffirming the use of the Helm chart for spiffe-enable itself.

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[gemini-code-assist]

Code Review

This pull request updates the README.md to include documentation for the new 'csi' injection mode and refines the installation instructions, clarifying the role of cofidectl and the Helm chart. The review focuses on ensuring the accuracy and clarity of these documentation changes. Key suggestions include correcting a typo, improving the precision of the CSI volume mount description, and fixing a markdown formatting issue.