[Incomplete] Implement welcome screen and rooms

[sampathBlam]

Implement welcome screen. Provide options to either directly play in a global room or create/select room and play.

Description

• install react router package
• Have a separate route for home and room
• Idea is to have options to select/create rooms in home
• Show play and rooms option
• Move to default room and start playing if play option is clicked

Motivation and Context

How Has This Been Tested?

Screenshots, if any

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

[sampathBlam]

@mahadevans87 , @existentialcoder:
The feature is not yet complete. But it is currently at the state where one can enter name, hit play and go about playing in the global room. The room list feature is in progress.
But you might wanna check the current set of changes and see if it makes sense to pull this to master before doing any further changes either w.r.t this feature or in other features.