Added basic example of usage of elapsedMillis library. Is very similar to the Playground example.
Change name to timingComparision as this code demonstrates the three typical methods of timing or delays in code.
Added missing pinMode statement that was preventing the LED from blinking. Also made minor formatting (no functional) changes.
Revert "Change name to timingComparision as this code demonstrates the three typical methods of timing or delays in code."

This reverts commit ee154ed6d6f00c6f90433c41359af646be5bf88f.