patch 9.1.0865: filetype: org files are not recognized

Problem:  filetype: org files are not recognized
Solution: detect '*.org' files as 'org' filetype,
          include filetype and syntax plugin
          (Luca Saccarola)

closes: #16054

Signed-off-by: Luca Saccarola <github.e41mv@aleeas.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/ftplugin/org.vim b/runtime/ftplugin/org.vim
new file mode 100644
index 0000000..45a5e19
--- /dev/null
+++ b/runtime/ftplugin/org.vim
@@ -0,0 +1,37 @@
+" Vim filetype plugin file
+" Language:	Org
+" Maintainer:	Luca Saccarola <github.e41mv@aleeas.com>
+" Last Change:	2024 Nov 14
+
+if exists("b:did_ftplugin")
+    finish
+endif
+let b:did_ftplugin = 1
+
+if exists('b:undo_ftplugin')
+    let b:undo_ftplugin .= "|setl cms< com< fo< flp<"
+else
+    let b:undo_ftplugin = "setl cms< com< fo< flp<"
+endif
+
+setl commentstring=#\ %s
+setl comments=fb:*,fb:-,fb:+,b:#,b:\:
+
+setl formatoptions+=nql
+setl formatlistpat=^\\s*\\(\\(\\d\\|\\a\\)\\+[.)]\\|[+-]\\)\\s\\+
+
+function OrgFoldExpr()
+    let l:depth = match(getline(v:lnum), '\(^\*\+\)\@<=\( .*$\)\@=')
+    if l:depth > 0 && synIDattr(synID(v:lnum, 1, 1), 'name') =~# '\m^orgHeadline'
+        return ">" . l:depth
+    endif
+    return "="
+endfunction
+
+if has("folding") && get(g:, 'org_folding', 0)
+    setl foldexpr=OrgFoldExpr()
+    setl foldmethod=expr
+    let b:undo_ftplugin .= "|setl foldexpr< foldmethod<"
+endif
+
+" vim: ts=8 sts=2 sw=2 et