feat(peopleadapter): create an interface

Author: akoushke

src/adapters/PeopleAdapter.js

@@ -0,0 +1,20 @@
+import {throwError} from 'rxjs';
+
+/**
+ * This is a base class that defines the interface that maps people data.
+ * Developers that want to extend `PeopleAdapter` must implement all of its methods,
+ * adhering to the exact parameters and structure of the returned objects
+ */
+export default class PeopleAdapter {
+  /**
+   * Returns an observable that emits person data
+   *
+   * @param {String} id - ID of person to get
+   * @returns {Observable<PersonObject>}
+   * @memberof PeopleAdapter
+   */
+  // eslint-disable-next-line no-unused-vars
+  getPerson(id) {
+    return throwError(new Error('getPerson(id) must be defined in PeopleAdapter'));
+  }
+}