docs(examples): add missing module (#4018)

Fixes the following error:

> test/todo-management/todo.tests.ts:275:3 - error TS2582: Cannot find name 'describe'. Do you need to install type definitions for a test runner? Try `npm i --save-dev @types/jest` or `npm i --save-dev @types/mocha`.

Co-authored-by: brownman <[email protected]>

Author: brownman

examples/basic-crud-application/server/package.json

@@ -24,6 +24,7 @@
     "uuid": "^8.3.2"
   },
   "devDependencies": {
+    "@types/mocha": "^8.2.3",
     "@types/chai": "^4.2.16",
     "@types/uuid": "^8.3.0",
     "chai": "^4.3.4",