refactor: rename apps to extensions

changelog.md

@@ -47,6 +47,7 @@
 - [#4194](https://github.com/ignite/cli/pull/4194) Bump client/v2 to `v2.0.0-beta.2`
 - [#4189](https://github.com/ignite/cli/pull/4189) Deprecate `ignite node` for `ignite connect` app
 - [#4210](https://github.com/ignite/cli/pull/4210) Improve default home wiring
+- [#4238](https://github.com/ignite/cli/pull/4238) Rename Ignite Apps to Ignite Extensions
 
 ### Fixes
 

docs/docs/extensions/01-using-extensions.md

@@ -0,0 +1,42 @@
+---
+description: Using and Developing Ignite Extensions
+---
+
+# Using Ignite Extensions
+
+Extensions offer a way to extend the functionality of the Ignite CLI. There are two
+core concepts within extensions: `Commands` and `Hooks`. `Commands` extend the CLI's
+functionality and `Hooks` extend existing CLI command functionality.
+
+Extensions are registered in an Ignite scaffolded blockchain project through the
+`extensions.yml`, or globally through `$HOME/.ignite/extensions/extensions.yml`.
+
+To use an extension within your project execute the following command inside the
+project directory:
+
+```sh
+ignite ext install github.com/project/cli-extension
+```
+
+The extension will be available only when running `ignite` inside the project
+directory.
+
+To use an extension globally on the other hand, execute the following command:
+
+```sh
+ignite ext install -g github.com/project/cli-extension
+```
+
+The command will compile the extension and make it immediately available to the
+`ignite` command lists.
+
+## Listing installed Extensions
+
+When in an ignite scaffolded blockchain you can use the command `ignite extension
+list` to list all Ignite Extensions and there statuses.
+
+## Updating Extensions
+
+When an extension in a remote repository releases updates, running `ignite extension
+update <path/to/extension>` will update an specific extension declared in your
+project's `config.yml`.