feat(docs): Populate Developer Portal with comprehensive documentation framework (#35217)

Co-authored-by: Claude <noreply@anthropic.com>

docs/developer_portal/viz-plugins/creating-viz-plugin.md

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+---
+title: Creating a Visualization Plugin
+sidebar_position: 2
+---
+
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+
+# Creating a Visualization Plugin
+
+🚧 **Coming Soon** 🚧
+
+Step-by-step guide to building your first custom visualization plugin for Apache Superset.
+
+## Topics to be covered:
+
+- Setting up the plugin development environment
+- Using the visualization plugin generator
+- Understanding the plugin file structure
+- Implementing the chart component
+- Creating the control panel interface
+- Adding data transformation logic
+- Testing your visualization locally
+- Debugging common issues
+- Packaging for distribution
+- Publishing to npm registry
+
+## Development Steps
+
+### 1. Project Setup
+- Clone the superset-ui repository
+- Install dependencies and development tools
+- Create a new plugin directory
+- Configure build and development scripts
+
+### 2. Chart Implementation
+- Define the main chart component
+- Handle data props and rendering
+- Implement responsive design
+- Add interactive features
+
+### 3. Configuration Interface
+- Design the control panel layout
+- Add form controls and validation
+- Implement conditional controls
+- Handle control state management
+
+### 4. Testing and Validation
+- Unit testing with Jest
+- Integration testing with Storybook
+- Visual regression testing
+- Performance benchmarking
+
+## Code Examples
+
+Examples will include:
+- Basic chart component structure
+- Control panel configuration
+- Data transformation functions
+- Event handling patterns
+
+---
+
+*This documentation is under active development. Check back soon for updates!*