add hardened_malloc package template

templates/hardened_malloc/INSTALL.msg

@@ -0,0 +1,32 @@
+
+The shared library will be installed at:
+
+	/usr/lib/libhardened_malloc.so
+	/usr/lib/libhardened_malloc-light.so
+
+It's will NOT become active on its own. To enable it system-wide, you must preload it.
+
+1. Test it first! Make sure a normal binary still runs:
+
+		LD_PRELOAD=/usr/lib/libhardened_malloc.so /bin/true && echo OK
+		LD_PRELOAD=/usr/lib/libhardened_malloc-light.so /bin/true && echo OK
+
+	If that prints OK, the library loads cleanly on this system.
+
+2. Enable system-wide by adding this single line to /etc/ld.so.preload
+	(create if file doesn't exist):
+
+		/usr/lib/libhardened_malloc.so
+
+		for light variant:
+		/usr/lib/libhardened_malloc-light.so
+
+	Per-process alternative (safer to trial): just export LD_PRELOAD as above
+	for the programs you want, instead of editing ld.so.preload.
+
+################ WARNING ################
+
+/etc/ld.so.preload is loaded by EVERY dynamically-linked program.
+If provided .so files are ever missing or broken while listed there, essential
+tools (your shell, sudo , xbps) may fail to start and you can lock
+yourself out of a running system.