[15] [Backend] Add API service

[markgravity]

https://github.com/markgravity/flutter-survey/issues/15

What happened

We need a service to handle the response from API call

Proof Of Work

flutter: *** Request ***
flutter: uri: https://nimble-survey-web-staging.herokuapp.com/api/v1/passwords
flutter: method: POST
flutter: responseType: ResponseType.json
flutter: followRedirects: true
flutter: connectTimeout: 0
flutter: sendTimeout: 0
flutter: receiveTimeout: 0
flutter: receiveDataWhenStatusError: true
flutter: extra: {}
flutter: headers:
flutter:  content-type: application/json; charset=utf-8
flutter: data:
flutter: {user: {email: dev}, client_id: z9iUamZLvRgtVVtRJ8UqItg2vmncGyEi30p1eWEddnA, client_secret: 1vqRNMxq-Yx83A61GNjLb17qxCGKxHDb8EmB3MKdxqA}
flutter:
flutter: *** Response ***
flutter: uri: https://nimble-survey-web-staging.herokuapp.com/api/v1/passwords
flutter: statusCode: 200
flutter: headers:
flutter:  connection: keep-alive
flutter:  cache-control: max-age=0, private, must-revalidate
flutter:  transfer-encoding: chunked
flutter:  date: Wed, 05 May 2021 16:41:54 GMT
flutter:  vary: Accept-Encoding, Origin
flutter:  content-encoding: gzip
flutter:  strict-transport-security: max-age=31536000; includeSubDomains
flutter:  referrer-policy: strict-origin-when-cross-origin
flutter:  x-permitted-cross-domain-policies: none
flutter:  content-type: application/json; charset=utf-8
flutter:  x-xss-protection: 1; mode=block
flutter:  server: Cowboy
flutter:  x-request-id: 194e982b-32c2-4954-9ba5-0fc898647a1c
flutter:  x-download-options: noopen
flutter:  x-runtime: 0.059444
flutter:  etag: W/"b56b6c7984837b9a0f28d86c950f1bac"
flutter:  via: 1.1 vegur
flutter:  x-frame-options: SAMEORIGIN
flutter:  x-content-type-options: nosniff
flutter: Response Text:
flutter: {"meta":{"message":"If your email address exists in our database, you will receive a password recovery link at your email address in a few minutes."}}

[manh-t]

the PR need rebasing 😄

[markgravity]

the PR need rebasing 😄

Thanks. I rebased it 👍