Add checkins

app/entities/checkin_request.rb

@@ -0,0 +1,17 @@
+module Adamantium
+  module Entities
+    class CheckinRequest < Dry::Struct
+      attribute :h, Types::Coercible::String
+      attribute :name, Types::Coercible::String.optional
+      attribute :content, Types::Coercible::String.optional
+      attribute :slug, Types::Coercible::String
+      attribute :url, Types::Coercible::String
+      attribute :category, Types::Array.of(Types::Coercible::String)
+      attribute :published_at, Types::Nominal::DateTime.optional
+      attribute :post_type, Types::Coercible::String
+      attribute :syndication_sources, Types::Array.of(Types::Coercible::String)
+      attribute :photos, Types::Array.of(Types::Hash)
+      attribute :location, Types::Coercible::String
+    end
+  end
+end