add procedure for standalone testing for meep-vis

# AdvantEDGE V2X Information System REST API

## Running the Server in Standalone mode

To run the server in standalone mode (for testing) i.e. without integrating it with AdvantEDGE, make the following changes:

- In _main.go_, replace the complete file with the following code:

  ```go

  package main

  import (

      "log"

      "net/http"

      sw "github.com/InterDigitalInc/AdvantEDGE/go-apps/meep-vis/server"

  )

  func main() {

      log.Printf("Server started")

      router := sw.NewRouter()

      log.Fatal(http.ListenAndServe(":8080", router))

  }

  ```

- In _go.mod_, add the following line in `replace`:

  ```go

  github.com/InterDigitalInc/AdvantEDGE/go-apps/meep-vis/server => ./server

  ```

- In _./server/vis.go_, remove all the code related to SBI and Redis. This includes

  - _sbi_ and _dkm_ imports

  - _Init()_, _Run()_ and _Stop()_ functions

- Run the server by using the command

  ```sh

  go run main.go

  ```

- Now the requests can be sent to

  ```

  http://localhost:8080/vis/v2/<endpoint>

  ```