Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/contact/config/install/contact.form.personal.yml

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+id: personal
+label: 'Personal contact form'
+recipients: {  }
+reply: ''
+weight: 0
+status: true
+langcode: en

core/modules/contact/config/install/contact.settings.yml

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+default_form: feedback
+flood:
+  limit: 5
+  interval: 3600
+user_default_enabled: true

core/modules/contact/config/schema/contact.schema.yml

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+# Schema for the configuration files of the Contact module.
+
+contact.form.*:
+  type: config_entity
+  label: 'Contact form'
+  mapping:
+    id:
+      type: string
+      label: 'ID'
+    label:
+      type: label
+      label: 'Label'
+    recipients:
+      type: sequence
+      label: 'Recipients'
+      sequence:
+        type: email
+        label: 'Email address'
+    reply:
+      type: text
+      label: 'Auto-reply'
+    weight:
+      type: integer
+      label: 'Weight'
+
+contact.settings:
+  type: config_object
+  label: 'Contact settings'
+  mapping:
+    default_form:
+      type: string
+      label: 'Default form identifier'
+    flood:
+      type: mapping
+      label: 'Flood control'
+      mapping:
+        limit:
+          type: integer
+          label: 'Limit'
+        interval:
+          type: integer
+          label: 'Interval'
+    user_default_enabled:
+      type: boolean
+      label: 'Personal contact form enabled by default'

core/modules/contact/config/schema/contact.views.schema.yml

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+# Schema for the views plugins of the Contact module.
+
+views.field.contact_link:
+  type: views.field.user_link
+  label: 'Link to user contact page'