added user display name field

config/default/field.field.user.user.su_display_name.yml

@@ -0,0 +1,22 @@
+uuid: 3b49ddd6-ecbd-4e8f-aea7-b9a3a8da2579
+langcode: en
+status: true
+dependencies:
+  config:
+    - field.storage.user.su_display_name
+  module:
+    - user
+_core:
+  default_config_hash: BFkWxDXmry0ok6Sec4-ximfjKrG5_w7jGuQZ5tmhwpY
+id: user.user.su_display_name
+field_name: su_display_name
+entity_type: user
+bundle: user
+label: 'Display Name'
+description: ''
+required: false
+translatable: false
+default_value: {  }
+default_value_callback: ''
+settings: {  }
+field_type: string

config/default/field.storage.user.su_display_name.yml

@@ -0,0 +1,23 @@
+uuid: 8681b8cb-db45-4c4a-9ee0-9d7e182ba667
+langcode: en
+status: true
+dependencies:
+  module:
+    - user
+_core:
+  default_config_hash: HK-i4oj7kD9UCrHKkuSky2WQKjsOOxoGoMQ1InmitAI
+id: user.su_display_name
+field_name: su_display_name
+entity_type: user
+type: string
+settings:
+  max_length: 255
+  is_ascii: false
+  case_sensitive: false
+module: core
+locked: false
+cardinality: 1
+translatable: true
+indexes: {  }
+persist_with_no_fields: false
+custom_storage: false