Update README

- Login via the frontend & select Sandbox tab

- Select a network to deploy in the user sandbox

- Create a unique MEC Application Instance ID

- Select & copy the MEC Sandbox endpoint up to value of MEC platform into util/uc1uc2.yaml sandbox 

- Select & copy the Appplication Instance Id into utill/uc1uc2.yaml appid

- Select & copy the MEC Sandbox endpoint up to value of MEC platform into app_instance1.yaml sandbox 

- Select & copy the Appplication Instance Id into app_instance1.yaml appid

- Select & copy your running app ip address into localurl + port into port configs

- Run main.go pass in arguments with path of your config 

## What's inside?

A quick look at the top-level relevant files and directories in demo 3 project.

- api (swagger documentation)

- server (server)

- util (configuration)

- server (server code)

- util (configurations)

- main (entry)

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