message: adding the graph api response interface
diff: import { GraphError } from "./GraphError";
  import { GraphRequestCallback } from "./IGraphRequestCallback";
  +/**
  + * @interface
  + * Signature for the json represent of the error response from the Graph API
  + * https://docs.microsoft.com/en-us/graph/errors
  + * @property {[key: string] : string | number} - The Key value pair
  + */
  +interface GraphAPIErrorResponse {
  + error: {
  + code: string;
  + message: string;
  + innerError: any;
  + };
  +}
  +
  /**
  * @class
  * Class for GraphErrorHandler
  @@ -57,7 +71,7 @@ export class GraphErrorHandler {
  * }
  * }
  */
  - private static constructErrorFromResponse(graphError: any, statusCode: number): GraphError {
  + private static constructErrorFromResponse(graphError: GraphAPIErrorResponse, statusCode: number): GraphError {
  const error = graphError.error;
  const gError = new GraphError(statusCode, error.message);
  gError.code = error.code;
  