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_4.tsv

@@ -1,12 +1,12 @@
-8   2048 0
-31   2048 0
-57   2048 0
-82   2048 0
-106   2048 0
-130   2048 0
-155   2048 0
-179   2048 0
-206   2048 0
-230   2048 0
-256   2048 0
-279   2048 0
+7   2048 0
+29   2048 0
+54   2048 0
+79   2048 0
+105   2048 0
+128   2048 0
+153   2048 0
+176   2048 0
+199   2048 0
+222   2048 0
+245   2048 0
+269   2048 0