Update README with new logo

Author: marcusschiesser

README.md

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-# AgentPond
+<p align="center">
+  <img src="docs/assets/agentpond-logo-gpt-image.png" alt="AgentPond - trace analytics for AI agents" width="720">
+</p>
 
 AgentPond is a data pond for AI agent traces with a agent-native CLI for local analytics. It accepts Langfuse SDK ingestion and its using the same data format, so you can use it as a drop-in replacement.