[s1895] Rewrite README as Markdown

* use Markdown syntax to allow github to display a formated README
* add new section "Further information" with links to various places
* move license to the end of the file to make things more readable
* add a note pointing to the COPYING file

(based on commit [12362] - c0e5c9d)
Fix a small issue for [s1894]

(based on commit 10394c9)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
Fix a comment of [s1891]. Thx to Reamer for pointing

(based on commit 61985c2)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>