docs: review developer section; add introduction

docs/developer/introduction/concepts.md

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+(developer.concepts)=
+# Concepts
+This section provides an overview of the core concepts of BEC Widgets, which are based on the single-responsibility principle and modular design.
+
+## Moduler Design
+We develop widgets with the single-responsibility principle in mind, meaning each widget is designed for a specific task. Our goal is to keep widgets simple, using them primarily for visualization or to initiate actions within BEC. Following these ideas, widgets should be designed to be reusable in various applications, making them versatile building blocks for larger GUIs. 
+
+We offer up to three different options for composing larger GUIs from these modular widgets: BECDesigner, DockArea widget, or scripting from the command line interface. More information about these options can be found in the user sections on [applications](user.applications).
+
+## Client-Server Architecture
+
+BEC Widgets is built on top of the [BEC](https://bec.readthedocs.io/en/latest/) package, which provides the backend for beamline experiment control. BEC Widgets is a client of BEC, meaning it can interact with the backend through a client-server architecture. To make full usage of the available features of BEC, we recommend to check the documentation about [data access](https://bec.readthedocs.io/en/latest/developer/data_access/data_access.html) in which the messaging and event system of BEC is described.
+In the context of BEC Widgets, the [`BECDispatcher`](/api_reference/_autosummary/bec_widgets.utils.bec_dispatcher.BECDispatcher) connects to this messaging and event system, allowing you to link your Qt [`Slots`](https://www.pythonguis.com/tutorials/pyside6-signals-slots-events/) to messages and event received from BEC.
+

docs/developer/introduction/contributing.md

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+(developer.contributing)=
+# Contributing
+
+If you like to contribute to the development of BEC Widgets, you can follow the steps below to set up your development environment.
+BEC Widgets works in conjunction with [BEC](https://bec.readthedocs.io/en/latest/). 
+Therefore, we recommend that you install BEC first following the [developer instructions](https://bec.readthedocs.io/en/latest/developer/getting_started/install_developer_env.html) and include BEC Widgets. 
+
+If you already have a BEC environment set up, you can install BEC Widgets in editable mode into your BEC Python environment.
+
+**Prerequisites**
+1. **Python Version:** BEC Widgets requires Python version 3.10 or higher. Verify your Python version to ensure compatibility.
+2. **BEC Installation:** BEC Widgets works in conjunction with BEC. While BEC is a dependency and will be installed automatically, you can find more information about BEC and its installation process in the [BEC documentation](https://beamline-experiment-control.readthedocs.io/en/latest/).
+3. **Qt Distributions:** BEC Widgets supports [PySide6](https://doc.qt.io/qtforpython-6/quickstart.html) and [PyQt6](https://www.riverbankcomputing.com/static/Docs/PyQt6/introduction.html). We use [qtpy](https://pypi.org/project/QtPy/) to abstract the underlying QT distribution.
+
+**Clone the Repository**: 
+```bash
+git clone https://gitlab.psi.ch/bec/bec_widgets
+cd bec_widgets
+```
+**Install in Editable Mode**:
+
+Please install the package in editable mode into your BEC Python environemnt. 
+```bash
+pip install -e '.[dev,pyside6]'
+```
+This installs the package together with [PySide6](https://doc.qt.io/qtforpython-6/quickstart.html).
+
+

docs/developer/introduction/introduction.md

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+(developer.introduction)=
+# Introduction
+BEC Widgets is a framework providing modular components that can be integrated into various larger GUI applications. Each widget serves a specific purpose adhering to the single-responsibility principle as detailed in our [concepts section](developer.concepts), and offers a straightforward, user-friendly interface.
+These widgets provide data visualisation tools and experimental control interfaces by triggering actions within BEC. 
+If you're interested in contributing to BEC Widgets, please refer to our [contributing guide](developer.contributing), which provides instructions for setting up your development environment and creating your own widgets.
+
+```{toctree}
+---
+maxdepth: 2
+hidden: false
+---
+
+concepts/
+contributing/
+```