feat: add support for multiple LLM providers including Azure, Anthropic, Vertex, and Ollama; update example.env and package.json

Author: gurvinder-dhillon

example.env

@@ -1,4 +1,26 @@
+# LLM provider to use. Options are "openai", "google" (google genai), "vertex", "anthropic", "ollama" or "azure".
 LLM_PROVIDER=google
-OPENAI_API_KEY=OPENAI_API_KEY
+
+# Model to use for the LLM provider.
 AUTOBROWSE_LLM_MODEL=gemini-2.0-flash-lite
-GOOGLE_API_KEY=GOOGLE_API_KEY
+
+# To use "openai" as the LLM provider, set following environment variables and keys.
+OPENAI_API_KEY=OPENAI_API_KEY
+
+# To use "google" GenAI as the LLM provider, set following environment variables and keys.
+GOOGLE_API_KEY=GOOGLE_API_KEY
+
+# To use "vertex" Google Vertex as the LLM provider, set following environment variables and keys.
+GOOGLE_APPLICATION_CREDENTIALS=credentials.json
+
+# To use "anthropic" as the LLM provider, set following environment variables and keys.
+ANTHROPIC_API_KEY=ANTHROPIC_API_KEY
+
+# To use "azure" as the LLM provider, set following environment variables and keys.
+AZURE_OPENAI_API_KEY=AZURE_OPENAI_API_KEY
+AZURE_OPENAI_ENDPOINT=https://yourendpoint.openai.azure.com/
+AZURE_OPENAI_API_VERSION=2024-12-01-preview
+AZURE_OPENAI_API_DEPLOYMENT_NAME=gpt-4o-mini
+
+# To use "ollama" as the LLM provider, set following environment variables.
+BASE_URL=http://localhost:11434