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/R/run_1.tsv

@@ -0,0 +1,13 @@
+12   1984 0
+37   2048 0
+61   2048 0
+86   2048 0
+110   2048 0
+132   2048 0
+156   2048 0
+178   2048 0
+200   2048 0
+222   2048 0
+245   2048 0
+265   2048 0
+288 0 0