runtime(mojo): include mojo ftplugin and indent script

Taken from excerpts of the Python ftplugin and adapted,
indent script simply sources the python indent script.

closes: #15171

Signed-off-by: Riley Bruins <ribru17@hotmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/.github/MAINTAINERS b/.github/MAINTAINERS
index e8c8647..ae5ba46 100644
--- a/.github/MAINTAINERS
+++ b/.github/MAINTAINERS
@@ -202,6 +202,7 @@
 runtime/ftplugin/meson.vim		@Liambeguin
 runtime/ftplugin/modula2.vim		@dkearns
 runtime/ftplugin/modula3.vim		@dkearns
+runtime/ftplugin/mojo.vim		@ribru17
 runtime/ftplugin/nginx.vim		@chr4
 runtime/ftplugin/nim.vim		@ribru17
 runtime/ftplugin/nroff.vim		@a-vrma
@@ -323,6 +324,7 @@
 runtime/indent/make.vim			@dkearns
 runtime/indent/meson.vim		@Liambeguin
 runtime/indent/mma.vim			@dkearns
+runtime/indent/mojo.vim			@ribru17
 runtime/indent/nginx.vim		@chr4
 runtime/indent/nsis.vim			@k-takata
 runtime/indent/occam.vim		@dkearns