Update README.md

components/hello-world/README.md

@@ -1,8 +1,19 @@
 # Hello-World
 
-This component displays platform specific hello world message.
+This component displays a platform-specific hello world message.
 
+## Build and test the Code
 
-## Prerequisite:
-
-[Node.js](https://nodejs.org/en): It requires node.js version 18.x.
+1. Navigate to `./components/hello-world/` through Command Line
+2. Do installations using the following command:
+  ```
+   npm install
+  ```
+3. Now build the code with the following command:
+   ```
+   npm run build
+   ```
+4. To execute the test cases of this component run the associated command.
+   ```
+   npm run test
+   ```