README.md update

Signed-off-by: Jean Bordat <bordat.jean@gmail.com>
borderRadius option

Signed-off-by: Jean Bordat <bordat.jean@gmail.com>
Adding new zIndex parameter

Signed-off-by: Jean Bordat <bordat.jean@gmail.com>
Update for main loader.

Signed-off-by: Jean Bordat <bordat.jean@gmail.com>
update for options

Signed-off-by: Jean Bordat <bordat.jean@gmail.com>