Provide default image bundle

media_entity_image_demo/config/install/field.field.media.image.image.yml

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+langcode: und
+status: true
+dependencies:
+  config:
+    - field.storage.media.image
+    - media_entity.bundle.image
+  module:
+    - image
+id: media.image.image
+field_name: image
+entity_type: media
+bundle: image
+label: Image
+description: ''
+required: true
+translatable: false
+default_value: {  }
+default_value_callback: ''
+settings:
+  file_directory: ''
+  file_extensions: 'png gif jpg jpeg'
+  max_filesize: ''
+  max_resolution: ''
+  min_resolution: ''
+  alt_field: false
+  alt_field_required: false
+  title_field: false
+  title_field_required: false
+  default_image:
+    fid: 0
+    alt: ''
+    title: ''
+    width: null
+    height: null
+  handler: default
+  handler_settings: {  }
+field_type: image

media_entity_image_demo/config/install/field.storage.media.image.yml

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+langcode: und
+status: true
+dependencies:
+  module:
+    - image
+    - media_entity
+id: media.image
+field_name: image
+entity_type: media
+type: image
+settings:
+  uri_scheme: public
+  default_image:
+    fid: 0
+    alt: ''
+    title: ''
+    width: null
+    height: null
+  target_type: file
+  display_field: false
+  display_default: false
+  target_bundle: null
+module: image
+locked: false
+cardinality: 1
+translatable: true
+indexes: {  }
+persist_with_no_fields: false

media_entity_image_demo/config/install/media_entity.bundle.image.yml

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+langcode: und
+status: true
+dependencies:
+  module:
+    - media_entity_image
+id: image
+label: Image
+description: 'Locally hosted images.'
+type: image
+type_configuration:
+  source_field: image
+  gather_exif: '0'
+field_map: {  }

media_entity_image_demo/media_entity_image_demo.info.yml

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+name: Media entity image demo
+description: 'Basic configuration for image media entities.'
+type: module
+package: Media
+core: 8.x
+dependencies:
+  - media_entity_image