Add Azure App Insights plugin

Signed-off-by: Joaquim Rocha <[email protected]>

Author: joaquimrocha

azure-app-insights/README.md

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+# azure-app-insights
+
+This is the default template README for [Headlamp Plugins](https://github.com/headlamp-k8s/headlamp).
+
+- The description of your plugin should go here.
+- You should also edit the package.json file meta data (like name and description).
+
+## Developing Headlamp plugins
+
+For more information on developing Headlamp plugins, please refer to:
+
+- [Getting Started](https://headlamp.dev/docs/latest/development/plugins/), How to create a new Headlamp plugin.
+- [API Reference](https://headlamp.dev/docs/latest/development/api/), API documentation for what you can do
+- [UI Component Storybook](https://headlamp.dev/docs/latest/development/frontend/#storybook), pre-existing components you can use when creating your plugin.
+- [Plugin Examples](https://github.com/headlamp-k8s/headlamp/tree/main/plugins/examples), Example plugins you can look at to see how it's done.