Add resource definitions for all 22 API tags, wire client accessors and require tree

lib/fiken/resources/inbox.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+module Fiken
+  module Resources
+    # /companies/{slug}/inbox — documents awaiting bookkeeping.
+    class Inbox < Resource::Base
+      include Resource::Listable
+      include Resource::Findable
+      include Resource::Deletable
+
+      def resource_path
+        "inbox"
+      end
+
+      # POST /inbox — multipart upload of an inbox document.
+      def create(path: nil, io: nil, filename: nil, content_type: "application/octet-stream", **fields)
+        parts = { "file" => build_file_part(path, io, filename, content_type) }
+        fields.each { |key, value| parts[key.to_s] = value.to_s unless value.nil? }
+        build_created(connection.post_multipart(base_path, parts))
+      end
+    end
+  end
+end