add Readme for the sample

typescript/samples/GettingStarted/README.md

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+# AutoGen TypeScript Getting Started Sample
+
+This sample demonstrates a simple multi-agent interaction using the AutoGen TypeScript framework. It shows how to create agents that can communicate with each other through messages and coordinated actions.
+
+## Overview
+
+The sample implements a counting sequence where:
+1. A "Modifier" agent receives a number and decrements it
+2. A "Checker" agent verifies the number and either:
+   - Continues the sequence if the number is > 1
+   - Stops the program if the number reaches 1
+
+## Agents
+
+### Modifier Agent
+- Receives a `CountMessage` containing a number
+- Decrements the number using a modifier function
+- Publishes a `CountUpdate` with the new value
+
+### Checker Agent
+- Receives the `CountUpdate` from the Modifier
+- Checks if the number meets the termination condition
+- Either continues the sequence or shuts down the application
+
+## Running the Sample
+
+1. Make sure you have Node.js and npm installed
+
+2. Install dependencies:
+```bash
+npm install
+```
+
+3. Run the sample:
+```bash
+npm start
+```
+
+## Expected Output
+You should see output similar to this:
+