feat: Added custom providers.

OpenAI.sln.DotSettings

@@ -1,3 +1,4 @@
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README.md

@@ -102,6 +102,19 @@ GetCurrentWeather({"location":"Dubai, UAE","unit":"celsius"})
 The current temperature in Dubai, UAE is 22°C with sunny weather.
 ```
 
+### Custom providers
+```csharp
+using OpenAI;
+
+using var api = Providers.GitHubModels("GITHUB_TOKEN");
+using var api = Providers.Azure("API_KEY", "ENDPOINT");
+using var api = Providers.DeepInfra("API_KEY");
+using var api = Providers.DeepSeek("API_KEY");
+using var api = Providers.Fireworks("API_KEY");
+using var api = Providers.OpenRouter("API_KEY");
+using var api = Providers.Together("API_KEY");
+```
+
 ### Constants
 All `tryGetXXX` methods return `null` if the value is not found.  
 There also non-try methods that throw an exception if the value is not found.

src/libs/OpenAI/Providers.cs

@@ -0,0 +1,92 @@
+// ReSharper disable once CheckNamespace
+namespace OpenAI;
+
+/// <summary>
+/// Predefined providers uses OpenAI SDK compatible API.
+/// </summary>
+public static class Providers
+{
+    /// <summary>
+    /// Create an API to use for GitHub Models: https://github.com/marketplace/models
+    /// </summary>
+    /// <returns></returns>
+    public static OpenAiApi GitHubModels(string githubToken)
+    {
+        var api = new OpenAiApi(baseUri: new Uri("https://models.inference.ai.azure.com/"));
+        api.AuthorizeUsingBearer(githubToken);
+
+        return api;
+    }
+
+    /// <summary>
+    /// Create an API to use for Azure.
+    /// </summary>
+    /// <returns></returns>
+    public static OpenAiApi Azure(string apiKey, string endpoint)
+    {
+        var api = new OpenAiApi(baseUri: new Uri(endpoint));
+        api.AuthorizeUsingBearer(apiKey);
+
+        return api;
+    }
+
+    /// <summary>
+    /// Create an API to use for DeepInfra.
+    /// </summary>
+    /// <returns></returns>
+    public static OpenAiApi DeepInfra(string apiKey)
+    {
+        var api = new OpenAiApi(baseUri: new Uri("https://api.deepinfra.com/"));
+        api.AuthorizeUsingBearer(apiKey);
+
+        return api;
+    }
+
+    /// <summary>
+    /// Create an API to use for DeepSeek.
+    /// </summary>
+    /// <returns></returns>
+    public static OpenAiApi DeepSeek(string apiKey)
+    {
+        var api = new OpenAiApi(baseUri: new Uri("https://api.deepseek.com/"));
+        api.AuthorizeUsingBearer(apiKey);
+
+        return api;
+    }
+
+    /// <summary>
+    /// Create an API to use for Fireworks AI.
+    /// </summary>
+    /// <returns></returns>
+    public static OpenAiApi Fireworks(string apiKey)
+    {
+        var api = new OpenAiApi(baseUri: new Uri("https://api.fireworks.ai/inference/v1"));
+        api.AuthorizeUsingBearer(apiKey);
+
+        return api;
+    }
+
+    /// <summary>
+    /// Create an API to use for Open Router.
+    /// </summary>
+    /// <returns></returns>
+    public static OpenAiApi OpenRouter(string apiKey)
+    {
+        var api = new OpenAiApi(baseUri: new Uri("https://openrouter.ai/api"));
+        api.AuthorizeUsingBearer(apiKey);
+
+        return api;
+    }
+
+    /// <summary>
+    /// Create an API to use for Together AI.
+    /// </summary>
+    /// <returns></returns>
+    public static OpenAiApi Together(string apiKey)
+    {
+        var api = new OpenAiApi(baseUri: new Uri("https://api.together.xyz/"));
+        api.AuthorizeUsingBearer(apiKey);
+
+        return api;
+    }
+}