chore: update docs

[venkatamutyala]

PR Type

Documentation

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Description

• Added a detailed introduction to explain the purpose and components of the OpenTofu action.
• Expanded the usage section with instructions on how to integrate the action into a GitHub workflow.
• Provided a comprehensive breakdown of triggers, job configuration, inputs, outputs, and error handling.
• Updated the example configuration to enable Slack notifications and reflect the latest version of the action.

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Changes walkthrough 📝

	Relevant files
Documentation	README.md Comprehensive documentation update for OpenTofu action usage README.md Added an introduction section explaining the action's purpose. Expanded usage instructions with environment variable examples. Detailed job configuration, inputs, outputs, and error handling. Updated the example to reflect changes in Slack notification settings. +87/-5

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪

🧪 No relevant tests

🔒 Security concerns Sensitive information exposure: The documentation shows examples of using AWS access keys and secrets through GitHub secrets. While the usage of secrets is correct, it would be good to add a note about ensuring these credentials have minimal required permissions and regular rotation.

⚡ Recommended focus areas for review Documentation Gap The documentation should include information about error recovery and troubleshooting steps when the manual approval times out or fails

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