Create 0003-extract-plugins.md

Author: david-monichi

docs/decisions/0003-extract-plugins.md

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+# 1. Externalize OpenSCD core plugins
+
+Date: 2024-11
+
+## Status
+
+Open
+
+## Context
+
+For a better expandability we would like to extract all plugins in a new plugins repository.
+
+## Decision
+
+Participants:
+ - ... link to github user
+
+Following the architectural decision in [OpenSCD Theming](./../0001-ADR-Theming.md) we would like to extract all OpenSCD Core plugins to an external repository.
+Doing so we are going to streamline the OpenSCD Core and provide a clean interface and structure for plugins.
+Further extracting the plugins we would introduce a shared UI-Component module which provides reusable UI-Components based on Svelte.
+
+Plugins would be in the repository [OpenSCD official Plugins](https://github.com/openscd/oscd-official-plugins) and the release strategy is defined [here](./0004-openscd-release-and-deploy-strategy.md).
+
+## Consequences
+
+- Clean Code in OpenSCD Core
+- Clear architectural structure of plugins
+- Building OpenSCD is more then building a simple repository
+- Clear path must be defined how to extend OpenSCD with custom plugins (full software cycle till deployment)
+- Release process for OpenSCD Core and OpenSCD official plugins