go rest api
-- added modules
-- added CRUD operation with mongodb
-- added rest client to consume a rest url
-- added unit testing Ref: https://codeburst.io/unit-testing-for-rest-apis-in-go-86c70dada52d
--added constants
--added Dockerfile
go rest api
-- added modules
-- added CRUD operation with mongodb
-- added rest client to consume a rest url
-- added unit testing Ref: https://codeburst.io/unit-testing-for-rest-apis-in-go-86c70dada52d
--added constants
--added Dockerfile