Add initial Swift programming language definition.

It's as the subject says. Adding Swift programing language definition.
No. Swift is not embedable in other script language. But that is the only way I manage to get the inline mix string and code to work. If you know a better way don't mind going for that. —Han.

On Tue, Jun 17, 2014 at 7:09 AM, Aram Kocharyan <notifications@github.com>
wrote:

>> @@ -2,3 +2,4 @@ php <\?(?:php)?.*?\?\>
>>  js <script\b[^\>]*>.*?</script>
>>  css <style\b[^\>]*>.*?</style>
>>  ruby (<%.*?%>)|(^%.*?[\r\n])
>> +swift \\\(.*?\)
> This is used for tags which may appear within other languages. As far as I know, Swift isn't a scripting language and can't be embedded inside another language's script?
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> https://github.com/aramk/crayon-syntax-highlighter/pull/195/files#r13835507