feat: Added Cohere custom provider.

Author: HavenDV

README.md

@@ -190,6 +190,7 @@ using var api = CustomProviders.SambaNova("API_KEY");
 using var api = CustomProviders.Mistral("API_KEY");
 using var api = CustomProviders.Codestral("API_KEY");
 using var api = CustomProviders.Cerebras("API_KEY");
+using var api = CustomProviders.Cohere("API_KEY");
 using var api = CustomProviders.Ollama();
 using var api = CustomProviders.LmStudio();
 ```

src/libs/tryAGI.OpenAI/CustomProviders.cs

@@ -71,6 +71,11 @@ public static class CustomProviders
     /// </summary>
     public const string HyperbolicBaseUrl = "https://api.hyperbolic.xyz/v1";
 
+    /// <summary>
+    /// 
+    /// </summary>
+    public const string CohereBaseUrl = "https://api.cohere.ai/compatibility/v1";
+    
     /// <summary>
     /// 
     /// </summary>
@@ -212,6 +217,15 @@ public static OpenAiClient Hyperbolic(string apiKey)
         return new OpenAiClient(apiKey, baseUri: new Uri(HyperbolicBaseUrl));
     }
 
+    /// <summary>
+    /// Create an API to use for Cohere.
+    /// </summary>
+    /// <returns></returns>
+    public static OpenAiClient Cohere(string apiKey)
+    {
+        return new OpenAiClient(apiKey, baseUri: new Uri(CohereBaseUrl));
+    }
+    
     /// <summary>
     /// Create an API to use for Ollama.
     /// </summary>

src/tests/OpenAI.IntegrationTests/CustomProvider.cs

@@ -20,4 +20,5 @@ public enum CustomProvider
     Codestral,
     Hyperbolic,
     Cerebras,
+    Cohere,
 }

src/tests/OpenAI.IntegrationTests/Tests.Helpers.cs

@@ -149,6 +149,13 @@ internal static (OpenAiClient Api, string Model) GetAuthorizedChatApi(CustomProv
                 throw new AssertInconclusiveException("XAI_API_KEY environment variable is not found.")),
                 model ?? "grok-beta");
         }
+        if (customProvider == CustomProvider.Cohere)
+        {
+            return (CustomProviders.Cohere(apiKey:
+                Environment.GetEnvironmentVariable("COHERE_API_KEY") ??
+                throw new AssertInconclusiveException("COHERE_API_KEY environment variable is not found.")),
+                model ?? "command-r-08-2024");
+        }
 
         var apiKey =
             Environment.GetEnvironmentVariable("OPENAI_API_KEY") ??