add docs for phone provider list command

docs/auth0_phone_provider_list.md

@@ -0,0 +1,51 @@
+---
+layout: default
+parent: auth0 phone provider
+has_toc: false
+---
+# auth0 phone provider list
+
+List your existing Phone providers. Currently we can create a max of 1 phone Provider, If none are created, you can create one by running `auth0 phone provider create`.
+
+## Usage
+```
+auth0 phone provider list [flags]
+```
+
+## Examples
+
+```
+  auth0 phone provider list
+  auth0 phone provider ls 
+  auth0 phone provider ls --json
+  auth0 phone provider ls --csv
+```
+
+
+## Flags
+
+```
+      --csv    Output in csv format.
+      --json   Output in json format.
+```
+
+
+## Inherited Flags
+
+```
+      --debug           Enable debug mode.
+      --no-color        Disable colors.
+      --no-input        Disable interactivity.
+      --tenant string   Specific tenant to use.
+```
+
+
+## Related Commands
+
+- [auth0 phone provider create](auth0_phone_provider_create.md) - Create the phone provider
+- [auth0 phone provider delete](auth0_phone_provider_delete.md) - Delete the phone provider
+- [auth0 phone provider list](auth0_phone_provider_list.md) - List your Phone providers
+- [auth0 phone provider show](auth0_phone_provider_show.md) - Show the Phone provider
+- [auth0 phone provider update](auth0_phone_provider_update.md) - Update the phone provider
+
+