Add table of contents>

Author: ludgerpaehler

Diff for: README.md

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 # Enzyme Tutorial
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+## Structure
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+1. Introduction to Automatic Differentiation
+2. Compiler-based Automatic Differentiation with Enzyme
+3. My First Derivative
+4. Custom Compiler Analyses
+5. Parallel Automatic Differentiation (CPU + GPU)
+6. Multi-Language Automatic Differentiation
+7. Using Enzyme as a Plugin and Future Work