docs: add new feature development template guide

new-feature-template/NewFeatureReadme.md

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+# New Feature Development Reference
+
+Quick reference for creating new graphics features in Community Shaders.
+
+## File Structure
+
+Template files to copy and customize:
+
+-   `template/NewFeature.h` → Copy to `src/Features/YourFeature.h`
+-   `template/NewFeature.cpp` → Copy to `src/Features/YourFeature.cpp`
+-   `template/New Feature/` → Copy to `features/YourFeature/`
+
+## Core System Registration
+
+These are the **required** files that must be modified for your feature to appear in settings:
+
+### 1. `src/Globals.h`
+
+**Forward Declaration** - Add at top with other feature declarations (~lines 1-30):
+
+struct YourFeature;
+
+**Feature Instance Declaration** - Add in `globals::features` namespace (~lines 51-80):
+
+extern YourFeature yourFeature;
+
+### 2. `src/Globals.cpp`
+
+**Feature Instance Definition** - Add in `globals::features` namespace (~lines 48-75):
+
+YourFeature yourFeature{};
+
+### 3. `src/Feature.cpp`
+
+**Feature Registration** - Add to features vector in `GetFeatureList()` (~lines 200-225):
+
+&globals::features::yourFeature,
+
+## Template Customization
+
+### Class Names
+
+-   Replace all `NewFeature` → `YourFeature`
+-   Replace all `"New Feature"` → `"Your Feature Name"`
+-   Replace all `"NewFeature"` → `"YourFeature"`
+
+### Metadata
+
+-   `GetCategory()` → Choose: "Lighting", "Effects", "Rendering", "Performance", "Terrain", "Water", "Atmosphere"
+-   `GetFeatureModLink()` → Update Nexus mod ID
+-   `GetFeatureSummary()` → Update description and features list
+-   `GetShaderDefineName()` → Your preprocessor define name
+-   `HasShaderDefine()` → Which shader types use your define
+
+### Settings
+
+-   Update `Settings` struct with your parameters
+-   Update `CbData` struct for shader constant buffer (must be 16-byte aligned)
+-   Update NLOHMANN serialization macro
+-   Customize `DrawSettings()` UI controls
+-   Update shader compilation paths in `CompileShaders()`
+
+### VR Support
+
+Set `SupportsVR()` return value:
+
+-   `return true;` - Feature works in VR
+-   `return false;` - Feature disabled in VR builds
+
+## Naming Conventions
+
+| Component          | Convention | Example                 |
+| ------------------ | ---------- | ----------------------- |
+| C++ Class          | PascalCase | `YourFeature`           |
+| Instance Variable  | camelCase  | `yourFeature`           |
+| Display Name       | Spaces     | `"Your Feature Name"`   |
+| Short Name         | PascalCase | `"YourFeature"`         |
+| Features Directory | PascalCase | `features/YourFeature/` |
+| Shader Directory   | PascalCase | `YourFeature/`          |
+
+## Automatic Build Integration
+
+The build system automatically handles:
+
+-   Shader compilation and validation
+-   Settings persistence (JSON serialization)
+-   UI menu integration
+-   Feature lifecycle management
+-   Cross-platform builds (SE/AE/VR)
+
+Build with: `./BuildRelease.bat ALL`
+
+## Testing Checklist
+
+-   [ ] Feature appears in settings menu
+-   [ ] Settings save/load correctly
+-   [ ] Shaders compile without errors
+-   [ ] Feature works in-game
+-   [ ] VR compatibility (if enabled)
+-   [ ] No build errors