This commit adds instructions to install necessary Qt development packages for generating symbols during the build process. It also updates the instructions for downloading `World.mwm` and `WorldCoast.mwm` files to include links to the files.
- instructions to download World*.mwm files and generate skins
- instructions how to attach historic commits
- minor fixes
Signed-off-by: Konstantin Pastbin <konstantin.pastbin@gmail.com>