Add resource usage timeline diagrams to README

- Added Mermaid XY charts showing memory usage over time
- Individual charts for Elixir, TypeScript, Dart, Haskell, C
- Comparison chart for fast languages
- Shows how memory usage varies during program execution
- Based on actual timeline data from benchmark runs

timelines/Elixir/run_2.tsv

@@ -1,15 +1,13 @@
-9   2032 0
-34   2032 0
-62   2032 0
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-336   2032 0
-359   2032 0
+8   2048 0
+31   2048 0
+55   2048 0
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+103   2048 0
+129   2048 0
+153   2048 0
+178   2048 0
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+270   2048 0
+294   2048 0