Document how to disable the formatter for a block of code

[gervaisb]

Hello,

Can we disable the formatter for a piece of code. Many other formatters are doing that and this is really usefull when working with streams or other kind of fluent code.

[philwebb]

@gervaisb You can use the following:

// @formatter:off
 
... code not be formatted

// @formatter:on

I'll add a note to the README about this.