Update docs

docs/resources/user_organization_assignment.md

@@ -10,7 +10,25 @@ description: |-
 
 note: if removed the user role will be reset to 'Organization User'
 
-
+## Example Usage
+
+```terraform
+data "env0_user" "user_example" {
+  email = "[email protected]"
+}
+
+resource "env0_custom_role" "custom_role" {
+  name = "custom-role"
+  permissions = [
+    "EDIT_PROJECT_SETTINGS"
+  ]
+}
+
+resource "env0_user_organization_assignment" "user_org" {
+  user_id        = data.env0_user.user_example.id
+  custom_role_id = env0_custom_role.custom_role.id
+}
+```
 
 <!-- schema generated by tfplugindocs -->
 ## Schema