docs: add docs/index.md mirroring README.md

Convention: docs/index.md must be identical to README.md for MkDocs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: HavenDV

docs/index.md

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+# Roboflow
+
+[![Nuget package](https://img.shields.io/nuget/vpre/Roboflow)](https://www.nuget.org/packages/Roboflow/)
+[![dotnet](https://github.com/tryAGI/Roboflow/actions/workflows/dotnet.yml/badge.svg?branch=main)](https://github.com/tryAGI/Roboflow/actions/workflows/dotnet.yml)
+[![License: MIT](https://img.shields.io/github/license/tryAGI/Roboflow)](https://github.com/tryAGI/Roboflow/blob/main/LICENSE.txt)
+[![Discord](https://img.shields.io/discord/1115206893015662663?label=Discord&logo=discord&logoColor=white&color=d82679)](https://discord.gg/Ca2xhfBf3v)
+
+## Features 🔥
+- Fully generated C# SDK based on [official Roboflow OpenAPI specification](https://inference.roboflow.com/openapi.json) using [AutoSDK](https://github.com/HavenDV/AutoSDK)
+- Same day update to support new features
+- Updated and supported automatically if there are no breaking changes
+- All modern .NET features - nullability, trimming, NativeAOT, etc.
+- Support .Net Framework/.Net Standard 2.0
+
+### Usage
+```csharp
+using Roboflow;
+
+using var client = new RoboflowClient(apiKey);
+```
+
+<!-- EXAMPLES:START -->
+<!-- EXAMPLES:END -->
+
+## Support
+
+Priority place for bugs: https://github.com/tryAGI/Roboflow/issues  
+Priority place for ideas and general questions: https://github.com/tryAGI/Roboflow/discussions  
+Discord: https://discord.gg/Ca2xhfBf3v  
+
+## Acknowledgments
+
+![JetBrains logo](https://resources.jetbrains.com/storage/products/company/brand/logos/jetbrains.png)
+
+This project is supported by JetBrains through the [Open Source Support Program](https://jb.gg/OpenSourceSupport).