[Fixes #132]: "Task: Create a skill.md file for AI Agents"

[mwallschlaeger]

Description

We had trouble that coding agents are not familiar with geonodectl in general. To introduce them to geonodectl without using tokens on each iteration with file can help agents to develop software using geonodectl.

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• Bug fix
• New feature
• Documentation update
• Refactoring
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Related Issue

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closes #132

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• The feature or bug fix has been discussed and documented in an issue beforehand.

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