Add Er der ferie? API

[Copilot]

Adds the Er der ferie? public JSON API to the Diverse section.

• README.md — new row in the Diverse table:

  | [Er der ferie?](https://www.erderferie.dk/api/v1) | JSON | Public |
  

Original prompt

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This section details on the original issue you should resolve

<issue_title>Er der ferie? API</issue_title>
<issue_description>API: https://www.erderferie.dk/api/v1
Type: JSON
Tilgængelighed: Public</issue_description>

<agent_instructions>Add this API to the list. </agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Er der ferie? API #153

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.