Add comprehensive README with usage examples

[Copilot]

• Create comprehensive README.md with overview, installation, usage, and examples
• Include example directory structure
• Document all CLI options
• Add examples for prompts, memories, and bootstrap scripts
• Add section on template parameters
• Include troubleshooting section
• Update .gitignore to exclude built binary
• Address code review feedback (improve template syntax example and YAML link)
• Restructure README following slack-cli pattern (more concise, added Prompt section)
• Remove Prompt section per feedback
• Replace "From Source" installation with direct download example

Original prompt

Write a README.md clearly explaining how to use this library. Include some examples.

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[alexec]

@copilot please look at https://github.com/kitproj/slack-cli for example README.

[Copilot]

@copilot please look at https://github.com/kitproj/slack-cli for example README.

Updated the README to follow the slack-cli pattern in commit 351f710. Key changes:

• Added "Prompt" section with ready-to-use text for AGENTS.md
• More concise structure (reduced from 365 to 254 lines)
• Streamlined examples (3 focused examples instead of 5 verbose ones)
• Simplified troubleshooting (bullet points instead of subsections)
• Removed redundant "Use Cases" and "See Also" sections
• More action-oriented language throughout

[alexec]

Delete this section.

[alexec]

@copilot make the requested changes

[Copilot]

@copilot make the requested changes

Made the requested changes in commit f06a433:

• Deleted the "Prompt" section
• Replaced "From Source" installation with direct download example using curl