improve the .gitignore list

Signed-off-by: Henrique Vicente <henriquevicente@gmail.com>
add the extra example which was used for creating fake data for a web site

Signed-off-by: Henrique Vicente <henriquevicente@gmail.com>
add the settings.json.dist to a .gitignore on the root of the extra example

Signed-off-by: Henrique Vicente <henriquevicente@gmail.com>
add info about the extra example

Signed-off-by: Henrique Vicente <henriquevicente@gmail.com>