Updated readme.md file to include some extra explanations

TypeScript/README.md

@@ -2,6 +2,18 @@
 
 This is the Gilded Rose kata in TypeScript.
 
+## Architecture
+
+The update logic is encapsulated in behaviors that define how different types of items are updated.
+
+- The `Item` class represents an item with properties like `name`, `sellIn`, and `quality`.
+
+- The `IUpdateBehavior` interface defines the contract for item update behaviors. Which is basically an `update` method that takes an `Item` and returns an updated `Item`. Each specific item type has its own implementation of this interface, such as `AgedBrieBehavior`, `BackstagePassBehavior`, etc. You can find these implementations in the `app/update-behaviors/implementations` directory.
+
+- The `getUpdateBehaviorFor(item)` function checks the item name and returns the correct instantiated behavior class. This is done in the `app/update-behaviors/behavior-resolver.ts` file.
+
+- The `GildedRose` class is responsible for managing the items. It has an `updateQuality` method that iterates through the items, retrieves the appropriate update behavior for each item via the resolver, and calls its `update` method.
+
 ## Getting started
 
 Install dependencies
@@ -12,46 +24,14 @@ npm install
 
 ## Run the unit tests from the Command-Line
 
-There are two unit test frameworks to choose from, Jest and Mocha.
+I chose to use Jest for unit tests and snapshot tests.
 
 ```sh
-npm run test:jest
+npm run test
 ```
 
 To run all tests in watch mode
 
 ```sh
-npm run test:jest:watch
+npm run test:watch
 ```
-
-Mocha
-
-```sh
-npm run test:mocha
-```
-
-
-## Run the TextTest fixture from the Command-Line
-
-_You may need to install `ts-node`_
-
-```sh
-npx ts-node test/golden-master-text-test.ts
-```
-
-Or with number of days as args:
-```sh
-npx ts-node test/golden-master-text-test.ts 10
-```
-
-You should make sure the command shown above works when you execute it in a terminal before trying to use TextTest (see below).
-
-
-## Run the TextTest approval test that comes with this project
-
-There are instructions in the [TextTest Readme](../texttests/README.md) for setting up TextTest. You will need to specify the Python executable and interpreter in [config.gr](../texttests/config.gr). Uncomment these lines:
-
-    executable:${TEXTTEST_HOME}/python/texttest_fixture.py
-    interpreter:python
-
-