Add page to create new timer

[nmpereira]

What

On the homepage "/", create a button to route the user to a room. A room would be "/:room".

How

When the user clicks on the "Start a timer" button, they get re-routed to a room. The room name (string) is generated on the server when sending a request to "/randomid" (this route does not exist yet). On the server, "/randomid" generates a random string (this will be improved in #18)

[MefDev]

I'll give it my best!

[MefDev]

Done! I added the routing to the corresponding URL.

[nmpereira]

Left comments on the PR to clarify the requirements. Let me know if the requirements are clear and/or if you have any questions