Add README for research-agent-team

Author: tbw-ai

entries/research-agent-team/README.md

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+# Build a research agent team where one agent finds, one verifies, one summarizes
+
+Three specialized agents working in sequence produce verified research in five minutes; one generalist agent doing all three jobs takes twenty minutes and produces ungrounded claims.
+
+This is part of [AI Building Tutorials](https://github.com/thebuilderweekly/ai-building-tutorials) by [The Builder Weekly](https://thebuilderweekly.com).
+
+**Read this tutorial:**
+- [In this repo](./tutorial.md) — the raw markdown with code blocks
+- [On the web](https://thebuilderweekly.com/tutorials/research-agent-team) — rendered with diagrams and syntax highlighting
+
+## What this tutorial teaches
+
+**Before:** You ask one agent to research a topic and it returns a confident summary mixing real facts, half-remembered training data, and outright fabrications, with no way to tell which is which.
+
+**After:** Three specialized agents run in sequence. The Researcher fetches primary sources. The Verifier checks every claim against those sources. The Summarizer writes only what survived verification.
+
+## Tools used
+
+anthropic-api
+
+## Pillar
+
+[Agent Teams](https://thebuilderweekly.com/tutorials/pillars/agent-teams)