Add some base YML and config.

config/schema/imageapi_optimize.schema.yml

+# Schema for configuration files of the ImageAPI Optimize module.
+
+imageapi_optimize.pipeline.*:
+  type: config_entity
+  label: 'Imageapi Optimize pipeline'
+  mapping:
+    name:
+      type: string
+    label:
+      type: label
+      label: 'Label'
+    processors:
+      type: sequence
+      sequence:
+        type: mapping
+        mapping:
+          id:
+            type: string
+          data:
+            type: imageapi_optimize.processor.[%parent.id]
+          weight:
+            type: integer
+          uuid:
+            type: string
+
+imageapi_optimize.processor.*:
+  type: mapping
+  label: 'Processor settings'
+
+imageapi_optimize.settings:
+  type: config_object
+  mapping:
+    default_pipeline:
+      type: string
+      label: 'Default ImageAPI Optimize pipeline'

imageapi_optimize.info.yml

+name: Image Optimize (or ImageAPI Optimize)
+type: module
+description: 'Define pipelines for image optimization and provide integration with core image styles.'
+core: 8.x
+# configure: # Todo

imageapi_optimize.libraries.yml

+admin:
+  version: VERSION
+  css:
+    theme:
+      css/imageapi_optimize.admin.css: {}

imageapi_optimize.links.action.yml

+imageapi_optimize_pipeline_add_action:
+  route_name: imageapi_optimize.pipeline_add
+  title: 'Add optimization pipeline'
+  appears_on:
+    - entity.imageapi_optimize_pipeline.collection

imageapi_optimize.links.menu.yml

+entity.imageapi_optimize_pipeline.collection:
+  title: 'Image Optimize pipelines'
+  description: 'Configure pipelines that can be used for optimizing images.'
+  parent: system.admin_config_media
+  route_name: entity.imageapi_optimize_pipeline.collection

imageapi_optimize.links.task.yml

+entity.imageapi_optimize_pipeline.edit_form:
+  title: 'Edit'
+  route_name: entity.imageapi_optimize_pipeline.edit_form
+  base_route: entity.iimageapi_optimize_pipeline.edit_form
+
+entity.imageapi_optimize_pipeline.collection:
+  title: List
+  route_name: entity.imageapi_optimize_pipeline.collection
+  base_route: entity.imageapi_optimize_pipeline.collection

imageapi_optimize.permissions.yml

+administer imageapi optimize pipelines:
+  title: 'Administer ImageAPI Optimize pipelines'

imageapi_optimize.routing.yml

+imageapi_optimize.pipeline_add:
+  path: '/admin/config/media/imageapi-optimize-pipelines/add'
+  defaults:
+    _entity_form: imageapi_optimize_pipeline.add
+    _title: 'Add ImageAPI Optimize pipeline'
+  requirements:
+    _permission: 'administer imageapi optimize pipelines'
+
+entity.imageapi_optimize_pipeline.edit_form:
+  path: '/admin/config/media/imageapi-optimize-pipelines/manage/{imageapi_optimize_pipeline}'
+  defaults:
+    _entity_form: imageapi_optimize_pipeline.edit
+    _title: 'Edit pipeline'
+  requirements:
+    _permission: 'administer imageapi optimize pipelines'
+
+entity.imageapi_optimize_pipeline.delete_form:
+  path: '/admin/config/media/imageapi-optimize-pipelines/manage/{imageapi_optimize_pipeline}/delete'
+  defaults:
+    _entity_form: 'imageapi_optimize_pipeline.delete'
+    _title: 'Delete'
+  requirements:
+    _permission: 'administer imageapi optimize pipelines'
+
+imageapi_optimize.processor_delete:
+  path: '/admin/config/media/imageapi-optimize-pipelines/manage/{imageapi_optimize_pipeline}/processors/{imageapi_optimize_processor}/delete'
+  defaults:
+    _form: '\Drupal\imageapi_optimize\Form\ImageAPIOptimizeProcessorDeleteForm'
+    _title: 'Delete imageAPI optimize processor'
+  requirements:
+    _permission: 'administer imageapi optimize pipelines'
+
+entity.imageapi_optimize_pipeline.collection:
+  path: '/admin/config/media/imageapi-optimize-pipelines'
+  defaults:
+    _entity_list: 'imageapi_optimize_pipeline'
+    _title: 'ImageAPI Optimize pipelines'
+  requirements:
+    _permission: 'administer imageapi optimize pipelines'
+
+imageapi_optimize.processor_add_form:
+  path: '/admin/config/media/imageapi-optimize-pipelines/manage/{imageapi_optimize_pipeline}/add/{imageapi_optimize_processor}'
+  defaults:
+    _form: '\Drupal\imageapi_optimize\Form\ImageAPIOptimizeProcessorAddForm'
+    _title: 'Add ImageAPI Optimize processor'
+  requirements:
+    _permission: 'administer imageapi optimize pipelines'
+
+imageapi_optimize.processor_edit_form:
+  path: '/admin/config/media/imageapi-optimize-pipelines/manage/{imageapi_optimize_pipeline}/processors/{imageapi_optimize_processor}'
+  defaults:
+    _form: '\Drupal\image\Form\ImageAPIOptimizeProcessorEditForm'
+    _title: 'Edit ImageAPI Optimizer processor'
+  requirements:
+    _permission: 'administer imageapi optimize pipelines'

imageapi_optimize.services.yml

+services:
+  plugin.manager.imageapi_optimize.processor:
+    class: Drupal\imageapi_optimize\ImageAPIOptimizeProcessorManager
+    parent: default_plugin_manager