Update 01-introduction.md.erb

Revise existing content.
Translate section 'Who Is This Book For?'
Add 'About the Authors' translation
Modified 'About the Authors' translation
Add 'Chapters & Sidebars' translation
Add 'Commits & Live Instances' translation
Add 'A Few Other Resources' translation
Add 'Do I Need Git?' translation
Add 'Getting in Touch' translation
Revised Translation
Fixed typo and improved content
Corrected thai spelling

use reference from http://th.wikipedia.org/
Fixed spelling/spacing
Merge pull request #2 from zarazi/master

'01-introduction' thai translation