runtime(indent-test): MS-Windows: Add Makefile for running indent tests

A few more unrelated changes:
- fix Vim script style of indent test
- Change comments to complete sentences in Filelist

closes: #14198

runtime/indent/Make_mvc.mak

@@ -0,0 +1,21 @@
+# Makefile for running indent tests on OS Windows.
+# Made on the base of a indent/Makefile.
+# Restorer, 13.03.2024
+
+.SUFFIXES:
+
+VIM = vim.exe
+VIMRUNTIME = ..
+
+# Run the tests that didn't run yet or failed previously.
+# If a test succeeds a testdir\*.out file will be written.
+# If a test fails a testdir\*.fail file will be written.
+test :
+	@ set "VIMRUNTIME=$(VIMRUNTIME)"
+	$(VIM) --clean --not-a-term -u testdir\runtest.vim
+
+
+clean testclean :
+	@ if exist testdir\*.fail del /q testdir\*.fail
+	@ if exist testdir\*.out del /q testdir\*.out
+