Added Structure for Backend Routing, Middleware, and More Documentation

[SAbbas2018]

[DEV-064] Backend Routes and Middleware

Fixes: #64

• [Y] Has the code been formatted?
• [Y] Have dependencies/packages been added?

Changes

Added Backend route structure, middleware skeletons that can be used for authenticating actions. Left TODOS and steps
to complete for functions. Added more documentation to the backend/README.md

Testing

• [Y] Does the code have sufficient automated test coverage? If not, include a reasoning and steps required to manually QA

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[krishchow]

All in all, this looks great, the one note that I have instead of creating structs in the routes, you can directly reference the models. You can also add the relevant json and gin tags there :D