add prompting courses and rename folders to snake_case

tool_use/README.md

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+# Tool use tutorial
+
+Welcome to Anthropic's comprehensive tool use tutorial. Across six lessons, you will learn everything you need to know to implement tool use successfully in your workflows with Claude. We recommend that you start from the beginning with the [tool use overview](./01_tool_use_overview.ipynb), as each lesson builds on key concepts taught in previous ones.
+
+## Table of contents
+* [Tool use overview](./01_tool_use_overview.ipynb)
+* [Your first simple tool](./02_your_first_simple_tool.ipynb)
+* [Forcing JSON with tool use](./03_structured_outputs.ipynb)
+* [The complete tool use workflow](./04_complete_workflow.ipynb)
+* [Tool choice](./05_tool_choice.ipynb)
+* [Building a chatbot with multiple tools](./06_chatbot_with_multiple_tools.ipynb)