Add providers module (base, factory)

src/promptforge/providers/factory.py

@@ -0,0 +1,26 @@
+from typing import Optional
+from .openai import OpenAIProvider
+from .anthropic import AnthropicProvider
+from .ollama import OllamaProvider
+from ..core.exceptions import ProviderError
+
+
+class ProviderFactory:
+    @staticmethod
+    def create(
+        provider_name: str,
+        model: Optional[str] = None,
+        temperature: float = 0.7,
+        api_key: Optional[str] = None,
+        **kwargs,
+    ):
+        provider_name = provider_name.lower()
+
+        if provider_name in ("openai", "gpt-4", "gpt-3.5"):
+            return OpenAIProvider(api_key=api_key, model=model or "gpt-4", temperature=temperature)
+        elif provider_name in ("anthropic", "claude"):
+            return AnthropicProvider(api_key=api_key, model=model or "claude-3-sonnet-20240229", temperature=temperature)
+        elif provider_name in ("ollama", "local"):
+            return OllamaProvider(model=model or "llama2", temperature=temperature, **kwargs)
+        else:
+            raise ProviderError(f"Unknown provider: {provider_name}")