git: Add gitignore to ensure directory is present even when empty

Signed-off-by: Mark Grant <m.grant.prg@gmail.com>

docs/misc/.gitignore

@@ -0,0 +1,19 @@
+#########################################################################
+#									#
+# Author: Copyright (C) 2024  Mark Grant				#
+#									#
+# Released under the GPLv3 only.					#
+# SPDX-License-Identifier: GPL-3.0-only					#
+#									#
+# N.B.									#
+# After changes to any gitignore file please run			#
+#		'git ls-files -i --exclude-standard'			#
+# to determine if any tracked files are now ignored.			#
+#									#
+#########################################################################
+
+# This .gitignore file is to ensure that this directory exists even though
+# empty. This is required because otherwise, after cloning, the project build
+# will fail citing this missing directory.
+# In other words, this is a git hack to satisfy AutoTools.
+