Implementation and testing of config/cli.go

[ABD-AZE]

Resolves #15

1. Building and testing done successfully
2. CliConfig Struct defined
3. as_provider() function serializes the struct to map[string]{interface}
4. written test for as_provider() function using viper for testing but any other config management lib can be used for the project as the testing was only for checking the serialization process.

[star-gazer111]

@ABD-AZE We are using Viper for now right?

[star-gazer111]

LGTM

[ABD-AZE]

I have used viper just for testing that the data is getting serialised. It is not necessary to use viper for the whole project.

[gerceboss]

@ABD-AZE ,Change ExecutionRPC to ExecutionRpc, similarly do for RPC and IP everywhere