Add the option to create a session

[fjallnari]

Users would have the option to create a room, then simply share the code with their friends to see the same timers. There are multiple things to keep in mind:

• sockets.io is needed for this, and the serverless Vercel, that we are deploying to right now is not ideal for sockets - might deploy the project to a VPS (domain?)
• should all the users in a given session have editing powers? or would roles need to be implemented?
• would time syncing work outta gate? possible need for date-based time tracking approach
• if we implement this, how would the interface for the offline bundled apps look like?