add document lane.

fastlane/Fastfile

@@ -19,3 +19,8 @@ lane :review do
   carthage(use_xcframeworks: true) if Helper.is_ci?
   scan(scheme: 'Tests')
 end
+
+desc "Creates documents."
+lane :document do
+  sh('swift package --allow-writing-to-directory ./docs generate-documentation --target HaishinKit --disable-indexing --hosting-base-path HaishinKit.swift --output-path ./docs')
+end

fastlane/README.md

@@ -21,6 +21,14 @@ For _fastlane_ installation instructions, see [Installing _fastlane_](https://do
 
 [CI] Review PullRequest.
 
+### document
+
+```sh
+[bundle exec] fastlane document
+```
+
+Creates documents.
+
 ----
 
 This README.md is auto-generated and will be re-generated every time [_fastlane_](https://fastlane.tools) is run.