Add README, LICENSE and screenshots

[Symbian9]

Please, add README.md, LICENSE and one or more screenshots:

• https://github.com/artem78/s60-gps-tracker-cli/blob/master/README.md
• https://github.com/artem78/s60-gps-tracker-cli/blob/master/LICENSE
• https://github.com/artem78/s60-gps-tracker-cli/blob/master/screenshot.png

[artem78]

Done. Thank you for report.