Added a Legal Advisor Agent (#1629)

## Description

Added a legal advisor agent

## Type of change

Please check the options that are relevant:

- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] Model update
- [ ] Infrastructure change

## Checklist

- [ ] My code follows Phidata's style guidelines and best practices
- [ ] I have performed a self-review of my code
- [ ] I have added docstrings and comments for complex logic
- [ ] My changes generate no new warnings or errors
- [ ] I have added cookbook examples for my new addition (if needed)
- [ ] I have updated requirements.txt/pyproject.toml (if needed)
- [ ] I have verified my changes in a clean environment

## Additional Notes

Include any deployment notes, performance implications, or other
relevant information:

---------

Co-authored-by: Yash Pratap Solanky <101447028+ysolanky@users.noreply.github.com>

cookbook/examples/agents/08_legal_agent.py

@@ -0,0 +1,32 @@
+from phi.agent import Agent
+from phi.knowledge.pdf import PDFUrlKnowledgeBase
+from phi.model.openai import OpenAIChat
+from phi.vectordb.pgvector import PgVector
+
+db_url = "postgresql+psycopg://ai:ai@localhost:5532/ai"
+
+knowledge_base = PDFUrlKnowledgeBase(
+    urls=[
+        "https://www.justice.gov/d9/criminal-ccips/legacy/2015/01/14/ccmanual_0.pdf",
+    ],
+    vector_db=PgVector(table_name="legal_docs", db_url=db_url),
+)
+knowledge_base.load(recreate=False)
+
+legal_agent = Agent(
+    name="LegalAdvisor",
+    knowledge=knowledge_base,
+    search_knowledge=True,
+    model=OpenAIChat(id="gpt-4o"),
+    markdown=True,
+    instructions=[
+        "Provide legal information and advice based on the knowledge base.",
+        "Include relevant legal citations and sources when answering questions.",
+        "Always clarify that you're providing general legal information, not professional legal advice.",
+        "Recommend consulting with a licensed attorney for specific legal situations.",
+    ],
+)
+
+legal_agent.print_response(
+    "What are the legal consequences and criminal penalties for spoofing Email Address ?", stream=True
+)