Add genai docs

docs/genai/api/csharp.md

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+---
+title: C# API
+description: C# API reference for ONNX Runtime GenAI
+has_children: false
+parent: API docs
+grand_parent: Generative AI (Preview)
+nav_order: 2
+---
+
+# ONNX Runtime GenAI C# API
+
+_Note: this API is in preview and is subject to change._
+
+{: .no_toc }
+
+* TOC placeholder
+{:toc}
+
+## Overview
+
+## Model class
+
+### Constructor
+
+```csharp
+public Model(string modelPath)
+```
+
+### Generate method
+
+```csharp
+public Sequences Generate(GeneratorParams generatorParams)
+```
+
+## Tokenizer class
+
+### Constructor
+
+```csharp
+public Tokenizer(Model model)
+```
+
+### Encode method
+
+```csharp
+public Sequences Encode(string str)
+```
+
+### Encode batch method
+
+```csharp
+public Sequences EncodeBatch(string[] strings)
+```
+
+### Decode method
+
+```csharp
+public string Decode(ReadOnlySpan<int> sequence)
+```
+
+### Decode batch method
+
+```csharp
+public string[] DecodeBatch(Sequences sequences)
+```
+
+### Create stream method
+
+```csharp
+public TokenizerStream CreateStream()
+```
+
+## TokenizerStream class
+
+### Decode method
+
+```csharp
+public string Decode(int token)
+```
+
+## GeneratorParams class
+
+### Constructor
+
+```csharp
+public GeneratorParams(Model model)
+```
+
+### Set search option (double)
+
+```csharp
+public void SetSearchOption(string searchOption, double value)
+```
+
+### Set search option (bool) method
+
+```csharp
+public void SetSearchOption(string searchOption, bool value)
+```
+
+### Set input ids method
+
+```csharp
+public void SetInputIDs(ReadOnlySpan<int> inputIDs, ulong sequenceLength, ulong batchSize)
+```
+
+### Set input sequences method
+
+```csharp
+public void SetInputSequences(Sequences sequences)
+```
+
+
+
+
+
+## Generator class
+
+### Constructor
+
+```csharp
+public Generator(Model model, GeneratorParams generatorParams)
+```
+
+### Is done method
+
+```csharp
+public bool IsDone()
+```
+
+### Compute logits
+
+```csharp
+public void ComputeLogits()
+```
+
+### Generate next token method
+
+```csharp
+public void GenerateNextTokenTop()
+```
+
+
+## Sequences class
+
+### Num sequences member
+
+```csharp
+public ulong NumSequences { get { return _numSequences; } }
+```
+
+### [] operator
+
+```csharp
+public ReadOnlySpan<int> this[ulong sequenceIndex]
+```
+

docs/genai/api/index.md

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+---
+title: API docs
+description: API documentation for ONNX Runtime GenAI
+parent: Generative AI (Preview)
+has_children: true
+nav_order: 2
+---
+
+_Note: this API is in preview and is subject to change._