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_3.tsv

@@ -1,13 +1,12 @@
-9   2032 0
-31   2032 0
-57   2032 0
-79   2032 0
-102   2032 0
-126   2032 0
-155   2032 0
-179   2032 0
-202   2032 0
-227   2032 0
-249   2032 0
-272   2032 0
-296   2032 0
+9   2048 0
+32   2048 0
+55   2048 0
+79   2048 0
+102   2048 0
+126   2048 0
+149   2048 0
+173   2048 0
+200   2048 0
+223   2048 0
+248   2048 0
+272   2048 0