Basic structure of the project

- Added a model with in-memory database, and routes, controller and
middleware to enable making initial CRUD calls to endpoints;

- Added jest and an initial test.

src/models/resource.ts

@@ -0,0 +1,11 @@
+export interface Resource {
+  id: number;
+  topicId: string;
+  url: string;
+  description: string;
+  type: string;
+  createdAt: string;
+  updatedAt: string;
+}
+
+export let resources: Resource[] = [];