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_1.tsv

@@ -1,16 +1,16 @@
-15   2032 0
-42   2032 0
-65   2032 0
-94   2032 0
-119   2032 0
-146   2032 0
-169   2032 0
-193   2032 0
-221   2032 0
-246   2032 0
-270   2032 0
-296   2032 0
-319   2032 0
-343   2032 0
-367   2032 0
-393   2032 0
+14   1984 0
+39   2064 0
+65   2064 0
+94   2064 0
+117   2064 0
+143   2064 0
+165   2064 0
+188   2064 0
+214   2064 0
+237   2064 0
+261   2064 0
+285   2064 0
+306   2064 0
+333   2064 0
+356   2064 0
+382   2064 0