Add org mode, close #706

ftplugin/org.vim

@@ -0,0 +1,28 @@
+if polyglot#init#is_disabled(expand('<sfile>:p'), 'org', 'ftplugin/org.vim')
+  finish
+endif
+
+" Vim filetype plugin for GNU Emacs' Org mode
+"
+" Maintainer:   Alex Vear <av@axvr.io>
+" License:      Vim (see `:help license`)
+" Location:     ftplugin/org.vim
+" Website:      https://github.com/axvr/org.vim
+" Last Change:  2020-01-04
+"
+" Reference Specification: Org mode manual
+"   GNU Info: `$ info Org`
+"   Web: <https://orgmode.org/manual/index.html>
+
+setlocal commentstring=#%s
+setlocal comments=fb:*,fb:-,fb:+,b:#,b:\:
+setlocal formatoptions+=ncqlt
+let &l:formatlistpat = '^\s*\(\d\+[.)]\|[+-]\)\s\+'
+
+setlocal foldexpr=org#fold_expr()
+setlocal foldmethod=expr
+
+if org#option('org_clean_folds', 0)
+    setlocal foldtext=org#fold_text()
+    setlocal fillchars-=fold:-
+endif

ftplugin/outline.vim

@@ -0,0 +1,23 @@
+if polyglot#init#is_disabled(expand('<sfile>:p'), 'org', 'ftplugin/outline.vim')
+  finish
+endif
+
+" Vim filetype plugin for GNU Emacs' Outline mode
+"
+" Maintainer:   Alex Vear <av@axvr.io>
+" License:      Vim (see `:help license`)
+" Location:     ftplugin/outline.vim
+" Website:      https://github.com/axvr/org.vim
+" Last Change:  2020-01-04
+"
+" Reference Specification: GNU Emacs Manual, section 'Outline Mode'
+"   GNU Info: `$ info Emacs Outline Mode`
+"   Web: <https://www.gnu.org/software/emacs/manual/html_node/emacs/Outline-Mode.html>
+
+setlocal foldexpr=org#fold_expr()
+setlocal foldmethod=expr
+
+if org#option('org_clean_folds', 0)
+    setlocal foldtext=org#fold_text()
+    setlocal fillchars-=fold:-
+endif