Added sqlite3 and reworked a the server

Signed-off-by: Sven Haardiek <Sven@Haardiek.de>
Revised Server

- Changed database from sqlite to redis
- Added readme.md
- Renamed testplayer1.py to testplayer.py
- Renamed rps-server.py to rps_server.py
- Revised rps_server.py
- Revised start.sh

Signed-off-by: Sven Haardiek <Sven@Haardiek.de>