GitOps docs: Install software (#20502)

- Update GitOps reference to cover the following user stories:
  - #14921 (4.50)
  - #18867 (4.55)
  - #19447 (4.56)
  - #19550 (4.56)

docs/Using Fleet/GitOps.md

@@ -25,6 +25,7 @@ policies:
 queries:
 agent_options:
 controls:
+software:
 org_settings: # Only default.yml
 team_settings: # Only teams/team-name.yml
 ```
@@ -33,6 +34,7 @@ team_settings: # Only teams/team-name.yml
 - [queries](#queries)
 - [agent_options](#agent-options)
 - [controls](#controls)
+- [software](#software)
 - [org_settings and team_settings](#org-settings-and-team-settings)
 
 ### policies
@@ -279,6 +281,43 @@ The `macos_setup` section lets you control the [end user migration workflow](htt
 
 Can only be configure for all teams (`default.yml`).
 
+### software
+
+The `software` section allows you to configure packages and Apple App Store apps that you want to install on your hosts.
+
+- `packages` is a list of software packages (.pkg, .msi, .exe, or .deb) and software specific options.
+- `app_store_apps` is a list of Apple App Store apps.
+
+##### Example
+
+```yaml
+software:
+  packages:
+   - url: https://github.com/organinzation/repository/package-1.pkg
+     install_script:
+       path: /lib/crowdstrike-install.sh 
+      pre_install_query: 
+        path: /lib/check-crowdstrike-configuration-profile.queries.yml
+      post_install_script:
+        path: /lib/crowdstrike-post-install.sh 
+      self_service: true
+    - url: https://github.com/organinzation/repository/package-2.msi
+  app_store_apps:
+   - app_store_id: 1091189122
+```
+
+#### packages
+
+- `url` specifies the URL at which the software is located. Fleet will download the software and upload it to S3 (default: `""`).
+- `install_script.path` specifies the command Fleet will run on hosts to install software. The [default script](https://github.com/fleetdm/fleet/tree/main/pkg/file/scripts) is dependent on the software type (i.e. .pkg).
+- `pre_install_query.path` is the osquery query Fleet runs before installing the software. Software will be installed only if the [query returns results](https://fleetdm.com/tables/account_policy_data) (default: `""`).
+- `post_install_script.path` is the script Fleet will run on hosts after intalling software (default: `""`).
+- `self_service` specifies whether or not end users can install from **Fleet Desktop > Self-service**.
+
+#### app_store_apps
+
+- `app_store_id` is the ID of the Apple App Store app. You can find this at the end of the app's App Store URL. For example, "Bear - Markdown Notes" URL is "https://apps.apple.com/us/app/bear-markdown-notes/id1016366447" and the `app_store_id` is `1016366447` (default: `0`).
+
 ### org_settings and team_settings
 
 #### features