Put benchmarks in separate benchmarks.md file.

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+# Benchmarks
+
+Some benchmarks, run on an ancient Thinkpad running Intel Core 2 Duo at 2GHz.
+
+|Implementation |  Time (sec)| Factor|
+|---------------|------------|-------|
+| Markdown.pl   | 2921.30    | 14606 |
+| PHP markdown  | 20.475     | 102.4 |
+| peg-markdown  | 5.330      |  26.7 |
+| commonmark.js | 2.730      |  13.6 |
+| marked        | 1.870      |   9.4 |
+| discount      | 1.660      |   8.3 |
+| cmark         | 0.290      |   1.4 |
+| sundown       | 0.200      |   1.0 |
+
+To run these benchmarks, use `make bench PROG=/path/to/program`.
+
+The input text is a 10MB Markdown file built by concatenating 20 copies
+of the Markdown source of the first edition of [*Pro
+Git*](https://github.com/progit/progit/tree/master/en) by Scott Chacon.
+
+`time` is used to measure execution speed.
+