[#70499202] Adds setup documentation to Routemaster
[#70499202] Improves the formatting
[#70499202] Mentions the .env files
[#70499202] Small copy change
Merge pull request #16 from HouseTrip/platform/update-docs-for-getting-service-up-and-running-70499202

Platform/update docs for getting service up and running 70499202