Docker NEEO/meta image for RPi

This is an initial version of a Dockerfile that creates Meta docker image for Raspbian (Raspberry Pi).
The image starts a script in /startup that tells PM2 to start mosquitos and node-red, then as a lost command, it runs node with the meta installed in /opt/meta (so: /opt/meta/node_modules/@jac459/metadriver/meta.js).
If the metadriver terminates, the container also stops.