runtime(arduino): Add Arduino ftplugin and indent files (#14811) Commit: https://github.com/vim/vim/commit/957d903cb7af41539efd3195d053293987af85d9 Author: K.Takata <kentkt@csc.jp> Date: Mon May 20 21:13:35 2024 +0900 runtime(arduino): Add Arduino ftplugin and indent files (https://github.com/vim/vim/issues/14811) We already have Arduino syntax file, but we didn't have ftplugin and indent files. This commit adds a basic ftplugin file and a basic indent file. Both of them are derived from {ftplugin,indent}/c.vim. Signed-off-by: Ken Takata <kentkt@csc.jp> Signed-off-by: Christian Brabandt <cb@256bit.org>