chore(docs): Add README.md, CHANGELOG.md, CODE_OF_CONDUCT.md

Signed-off-by: provokateurin <kate@provokateurin.de>

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- First release

CODE_OF_CONDUCT.md

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+In the Nextcloud community, participants from all over the world come together to create Free Software for a free internet. This is made possible by the support, hard work and enthusiasm of thousands of people, including those who create and use Nextcloud software.
+
+Our code of conduct offers some guidance to ensure Nextcloud participants can cooperate effectively in a positive and inspiring atmosphere, and to explain how together we can strengthen and support each other.
+
+The Code of Conduct is shared by all contributors and users who engage with the Nextcloud team and its community services. It presents a summary of the shared values and “common sense” thinking in our community.
+
+You can find our full code of conduct on our website: https://nextcloud.com/code-of-conduct/
+
+Please, keep our CoC in mind when you contribute! That way, everyone can be a part of our community in a productive, positive, creative and fun way.

README.md

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+# App Template
+
+A template to get started with Nextcloud app development.
+
+## Usage
+
+- To get started easily use the [Appstore App generator](https://apps.nextcloud.com/developer/apps/generate) to
+  dynamically generate an App based on this repository with all the constants prefilled.
+- Alternatively you can use the "Use this template" button on the top of this page to create a new repository based on
+  this repository. Afterwards adjust all the necessary constants like App ID, namespace, descriptions etc.
+
+Once your app is ready follow the [instructions](https://nextcloudappstore.readthedocs.io/en/latest/developer.html) to
+upload it to the Appstore.
+
+## Resources
+
+### Documentation for developers:
+
+- General documentation and tutorials: https://nextcloud.com/developer
+- Technical documentation: https://docs.nextcloud.com/server/latest/developer_manual
+
+### Help for developers:
+
+- Official community chat: https://cloud.nextcloud.com/call/xs25tz5y
+- Official community forum: https://help.nextcloud.com/c/dev/11