vagrant-plugin: add page (#15682)

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>
Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/common/vagrant-plugin.md

@@ -0,0 +1,29 @@
+# vagrant plugin
+
+> Manage Vagrant plugins.
+> See also: `vagrant`.
+> More information: <https://developer.hashicorp.com/vagrant/docs/cli/plugin>.
+
+- List all the plugins currently installed:
+
+`vagrant plugin list`
+
+- Install a plugin from remote repositories, usually RubyGems:
+
+`vagrant plugin install {{vagrant_vbguest}}`
+
+- Install a plugin from a local file source:
+
+`vagrant plugin install {{path/to/my_plugin.gem}}`
+
+- Update all installed plugins to their latest version:
+
+`vagrant plugin update`
+
+- Update a plugin to the latest version:
+
+`vagrant plugin update {{vagrant_vbguest}}`
+
+- Uninstall a specific plugin:
+
+`vagrant uninstall {{vagrant_vbguest}}`