Updated Extensions docs

docs/extensions/get-started/your-first-extension.md

@@ -2,20 +2,45 @@
 
 In this topic, we'll teach you the fundamental concepts for building extensions. Make sure you have [Node.js](https://nodejs.org/en/) and [Git](https://git-scm.com/) installed....
 
+## Installing and Building the extension
+
+Simple Lens extension that adds "hello-world" page to a cluster menu.
+
+### Linux
+
+```sh
+mkdir -p ~/.k8slens/extensions
+git clone https://github.com/lensapp/lens-extension-samples.git ~/.k8slens/extensions
+```
+
+To build the extension you can use `make` or run the `npm` commands manually:
+
+```sh
+cd ~/.k8slens/extensions/helloworld-sample
+make build
+```
+
+OR
+
+```sh
+cd ~/.k8slens/extensions/helloworld-sample
+npm install
+npm run build
+```
+
+Open Lens application and navigate to a cluster. You should see "Hello World" in the Lens sidebar menu.
+
 ## Developing the extension
 
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-
-## Debugging the extension
-
-And now this:
-
-- One
-- Two
-- Three
+Let's make a change to the message:
 
+* Change the message from Hello World from HelloWorld! to **Hello Lens Extensions** in `page.tsx`
+* Rebuild the extension
+* Reload the Lens window
+* You should see the updated message showing up.
 
 ## Next steps
 
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+In the next topic, [Extension Anatomy](anatomy.md), we'll take a closer look at the source code of the Hello World sample and explain key concepts.
 
+You can find the source code of this tutorial at: [lensapp/lens-extension-samples](https://github.com/lensapp/lens-extension-samples/tree/master/helloworld-sample). The [Extension Guides](../guides/overview.md) topic contains other samples, each illustrating a different Lens Extension API.