feat: expand ServiceIO documentation with comprehensive features and benefits

Author: NonSwag

content/docs/serviceio/index.mdx

@@ -4,4 +4,106 @@ description: A vault drop-in replacement with a new and modern api
 icon: BookMarked
 ---
 
-Coming soon!
+ServiceIO is a powerful, modern replacement for Vault that provides a comprehensive service layer for Minecraft servers.
+It offers the traditional Vault API and the VaultUnlocked API while extending functionality far beyond what Vault provides.
+
+**100% Vault and VaultUnlocked compatibility**, just remove the Vault plugin and drop in ServiceIO.
+
+## What is ServiceIO?
+
+ServiceIO is designed as a drop-in replacement for Vault, but with significantly more features and a cleaner, more modern API.
+While Vault focuses primarily on economy services, ServiceIO provides unified interfaces for:
+
+- **Economy Services** - Balance management, transactions, and banking  
+- **Permission Services** - Groups and permissions  
+- **NPC Services** - NPC management  
+- **Hologram Services** - Unified hologram API  
+- **Chat Services** - Chat formatting and prefixes/suffixes  
+- **Service Conversion** - Convert data between different service providers
+
+## Key Features
+
+### Service Provider Flexibility
+
+ServiceIO allows you to switch between different service providers (like economy or permission plugins) without losing your data.
+The built-in conversion system lets you migrate from one plugin to another seamlessly.
+While Vault offers the same functionality for economy services, ServiceIO makes it possible for all services.
+This allows you to switch from, lets say, GroupManager to LuckPerms in a breeze, or from Citizens to FancyNPCs.
+
+
+### Full Compatibility
+- **Vault API** - Complete drop-in replacement
+- **VaultUnlocked API** - Modern async-capable alternative
+- **Paper & Folia** - Optimized for modern server software
+- **PlaceholderAPI** - Extensive placeholder support
+
+## Supported Services
+
+### Economy
+- Balance management (per-world support)
+- Banking systems
+- Currency formatting
+- Multi-language support
+- Support for multiple currencies
+
+### Permissions
+- Group management
+- Permission assignment
+- Prefix/suffix handling
+- Inheritance systems
+- World-specific permissions
+
+### NPC Management
+- Unified NPC API
+- Event handling
+
+### Holograms
+- Unified Hologram API
+- Dynamic content updates
+
+## How does ServiceIO Work?
+
+ServiceIO uses a wrapper-based architecture that creates a bridge between different service APIs:
+
+```mermaid
+graph TD;
+subgraph AA [Plugins]
+A[Vault plugin];
+B[ServiceIO plugin];
+C[VaultUnlocked plugin];
+end
+subgraph BB [Wrapped Services]
+E[Vault];
+F[ServiceIO];
+G[VaultUnlocked];
+end
+Z[ServiceIO];
+A --> Z;
+B --> Z;
+C --> Z;
+Z --> E;
+Z --> F;
+Z --> G;
+```
+
+This design allows:
+- **Multi-directional Compatibility** - Vault plugins work with modern services and vice versa
+- **Service Abstraction** - Switch providers without changing your plugins
+- **Enhanced Features** - Access advanced features through the ServiceIO API
+
+## Why Choose ServiceIO?
+
+### For Server Administrators
+- **Easy Migration** - Convert between different plugins effortlessly
+- **Better Performance** - Optimized for modern server software
+- **Comprehensive Support** - Handles economy, permissions, NPCs, and more
+
+### For Developers
+- **Clean APIs** - Modern, well-documented interfaces
+- **Future-Proof** - Built for current and upcoming Minecraft versions
+- **Type Safety** - Better IDE support and fewer runtime errors
+
+### For Players
+- **Seamless Experience** - All your favorite plugins work together
+- **Data Preservation** - Never lose progress during plugin changes
+- **Better Performance** - Faster responses and reduced lag