Add Jest to TypeScript (and update dependencies)

TypeScript/README.md

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+# Gilded Rose
+
+This is the Gilded Rose kata in TypeScript.
+
+## Getting started
+
+Install dependencies
+
+```sh
+npm install
+```
+
+## Running tests
+
+To run all tests
+
+### Jest way
+
+```sh
+npm run test:jest
+```
+
+To run all tests in watch mode
+
+```sh
+npm run test:jest:watch
+```
+
+### Mocha way
+
+```sh
+npm run test:mocha
+```