install.md: add note about -H windowsgui for avoiding the Windows console

Signed-off-by: Elias Naur <mail@eliasnaur.com>
install.md: note the directory of the ANGLE driver

Signed-off-by: Elias Naur <mail@eliasnaur.com>
faq.md: add FAQ

Fixes gio#14

Signed-off-by: Elias Naur <mail@eliasnaur.com>
integrate.md: fix typos

Signed-off-by: Elias Naur <mail@eliasnaur.com>
contribute.md,integrate.md: add contribution and integration guides

Signed-off-by: Elias Naur <mail@eliasnaur.com>
install.md: rename dependencies.md

Add table of contents.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
dependencies.md: add dependency page

Signed-off-by: Elias Naur <mail@eliasnaur.com>
index.md: add wiki index

Signed-off-by: Elias Naur <mail@eliasnaur.com>