Add first agentic top ten code samples

Author: Allie Howe

initiatives/agent_security_initiative/code_samples/agentic_top_ten/frameworks/mastra/invoice_agent/README.md

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+# Mastra Invoice Agent
+This agent reviews submitted invoices with competing goals: approving invoices quickly and maintaining that 
+approved invoices stay below a predefined threshold amount. What could possibly go wrong?
+
+## Architecture Diagram
+![Invoice Agent Architecture](insecure-invoice-agent.jpg)
+
+## Details on the goal manipulation and memory poisoning vulnerabilities
+https://docs.google.com/presentation/d/1ETszW07qVMMCYO_MZD16PEKTmp9EV1HP/edit?usp=sharing&ouid=105327696040816402498&rtpof=true&sd=true
+
+## To run the code
+Make a .env inside of ./invoice_agent and add your `ANTHROPIC_API_KEY`
+
+`npm install`
+
+`npm run dev`

initiatives/agent_security_initiative/code_samples/agentic_top_ten/frameworks/mastra/invoice_agent/insecure-invoice-agent.jpg

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+output.txt
+node_modules
+dist
+.mastra
+.env.development
+.env
+*.db
+*.db-*