5 chalk 5x requires ESM (#6)

* new chalk version

* esm support

* mocha config

* README and lint

.mocharc.json

@@ -0,0 +1,7 @@
+{
+    "node-option": [
+        "experimental-specifier-resolution=node",
+        "loader=ts-node/esm"
+    ],
+    "url" : "https://stackoverflow.com/questions/64261239/mocha-tests-with-esm-support-for-native-es6-modules"
+}

README.md

@@ -6,15 +6,17 @@ to create and test Command-Line Interfaces (CLIs) written in TypeScript.
 
 This project updates the
 [How to Create a Testable CLI using TypeScript?](https://www.realpythonproject.com/how-to-create-a-testable-cli-using-typescript/)
-from Jan 2023 with various fixes that were not obvious (at least to me).
+tutorial from Jan 2023 with various fixes that were not obvious (at least to me).
 
-These include:
+In particular, it modifies the import syntax and tsconfig.json to work with 
+ECMAScript Modules (ESM), such as Chalk v5.x.
+
+Other changes include:
 
-* Restricting "chalk" to "^4.1.2"
 * Avoiding the confusingly-named 'npm run install'
 * import { expect } from "chai";
 * "test" : "mocha --require ts-node/register test/**/*.ts"
-* Add node GitHub Action (tests dist/src/index.js, not installed version) 
+* Adding node GitHub Action (for continuous testing)
 
 
 ## Usage