Prepare english documents for build and install

[MSakamaki]

From @dynamis on February 2, 2016 6:59

We currently have this page in wiki https://github.com/MozOpenHard/CHIRIMEN/wiki/Setup

but it don't contain enough/full information like this: https://github.com/MozOpenHard/CHIRIMEN-tools/blob/master/doc/installFirefoxOS.pdf

let's prepare english documents to work with global contributors. I believe this document should be prepared before the general availability (-> Milestone 1).

Copied from original issue: MozOpenHard/CHIRIMEN#58

[MSakamaki]

From @dynamis on February 2, 2016 7:6

Better to write in MDN? https://developer.mozilla.org/en-US/Firefox_OS/Board_guide/CHIRIMEN or write in our Wiki and link from MDN?

I prefer to write in MDN since it support l10n and we can find relating information about porting to other boards (will coming soon?) within the same site.

[ghost]

handle this on #162