docs: Expand LLM configuration options in README

Author: vishnurajkv

README.md

@@ -50,10 +50,18 @@ pip install -e .
 
 ## Configuration
 
-Set your provider credentials before running scans:
+Set your model and provider credentials before running scans:
 
 ```bash
-# Example for DeepSeek via Nebius
+# OpenAI
+export SECNODE_LLM="openai/gpt-4o"
+export OPENAI_API_KEY="your-api-key"
+
+# Anthropic
+export SECNODE_LLM="anthropic/claude-3-5-sonnet-20241022"
+export ANTHROPIC_API_KEY="your-key"
+
+# Nebius (OAI-Compatible)
 export SECNODE_LLM="nebius/deepseek-ai/DeepSeek-V3.2"
 export NEBIUS_API_KEY="your-key"
 export NEBIUS_API_BASE="https://api.tokenfactory.nebius.com/v1/"