Add API key creation instructions to README

[amavashev]

Summary

Added documentation to the README explaining how to create and manage API keys for the Cycles platform.

Key Changes

• Added a detailed "Need an API key?" section after the basic usage example with:
  • Reference to the deployment guide
  • Complete curl command example for creating API keys via the Cycles Admin Server (port 7979)
  • Instructions on how to extract and save the generated key
  • Link to API Key Management documentation for rotation and lifecycle details
• Added a brief reference note in the configuration section pointing users to API key creation resources

Details

The new documentation provides users with:

1. A complete, copy-paste ready curl command to create API keys through the Admin Server
2. Clear warning that the key is shown only once and must be saved immediately
3. Links to both the deployment guide and API key management documentation for additional context
4. Placement in two logical locations: after the basic usage example and in the configuration section

https://claude.ai/code/session_01HftF1nebzvUzQy4y4zGJk6