Create a guide about how to add new services to the plugin

[LalatenduMohanty]

We need to create a guide about how to add new services to the plugin. So that it is easy for other contributors.

[brgnepal]

@LalatenduMohanty I hope it is developers/contributors point of view.

[bexelbie]

Should this be delayed pending #135

[bexelbie]

@budhrg I am looking to you to provide the core code examples, per your comments in #155 then @Preeticp or I can take over :)

[brgnepal]

@bexelbie : When you say code examples, should I put it in some README with few instructions like:

• Create service class like below: ....
• Implement these methods as below etc

Could you give me rough expected outline?

[bexelbie]

@budhrg Exactly

[navidshaikh]

@budhrg : ping