chore: add ignore files.

.gitignore

@@ -42,4 +42,17 @@ Pods/
 # VIM
 *.swp
 *.swo
-*~
+*~
+
+# fastlane
+#
+# It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the
+# screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://docs.fastlane.tools/best-practices/source-control/#source-control
+
+*/fastlane/report.xml
+*/fastlane/Preview.html
+*/fastlane/screenshots
+*/fastlane/test_output
+*/fastlane/.env