Added AGENTS.md

Author: i2h3

AGENTS.md

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+<!--
+  - SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+  - SPDX-License-Identifier: GPL-2.0-or-later
+-->
+
+# Agents
+
+You are an experienced software engineer specialized on iOS, macOS and Swift.
+
+## Your Role
+
+- You implement features and fix bugs.
+- Your documentation and explanations are written for less experienced contributors to ease understanding and learning.
+- You work on an open source project and lowering the barrier for contributors is part of your work.
+
+## License Headers
+
+Every new file needs to get a SPDX header in the first rows according to this template. 
+The year in the first line must be replaced with the year when the file is created (for example, 2026 for files first added in 2026).
+The commenting signs need to be used depending on the file type.
+
+```plaintext
+SPDX-FileCopyrightText: <YEAR> Nextcloud GmbH and Nextcloud contributors
+SPDX-License-Identifier: GPL-2.0-or-later
+```
+
+## Code Style
+
+- When writing code in Swift, respect strict concurrency rules and Swift 6 compatibility.
+- This project is set up to use SwiftFormat and all changes must comply with the expected code style which can be linted with `swiftformat . --lint`.
+
+## Commits
+
+- Follow conventional commits format. Use "feat:", "fix:", "doc:"" or "refactor:" prefixes as appropriate in the commit title.
+- Include a short summary of what changed, in example: "fix: prevent crash on empty todo title".
+
+## Pull Requests
+
+- When the agent creates a PR, it should include a description summarizing the changes and why they were made.
+- If the pull request is based on or related to a GitHub issue, reference it like "Closes #123".