docs: added api reference; closes #123

docs/developer/developer.md

@@ -1,6 +1,14 @@
 (developer)=
 # Development
 
+```{toctree}
+---
+maxdepth: 1
+hidden: true
+---
+reference/
+```
+
 To contribute to the development of BEC Widgets, start by setting up the development environment:
 
 1. **Clone the Repository**: 
@@ -13,4 +21,6 @@ cd bec-widgets
 Installing the package in editable mode allows you to make changes to the code and test them in real-time.
 ```bash
 pip install -e .[dev]
-```
+```
+
+

docs/developer/reference.md

@@ -0,0 +1,10 @@
+## API Reference
+
+```{eval-rst}
+.. autosummary::
+   :toctree: _autosummary
+   :template: custom-module-template.rst
+   :recursive:
+
+   bec_widgets
+```