vmtouch: add page (#15363)

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>
Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/common/vmtouch.md

@@ -0,0 +1,24 @@
+# vmtouch
+
+> Manage the filesystem cache.
+> More information: <https://manned.org/vmtouch>.
+
+- Print the cache status of a file:
+
+`vmtouch {{path/to/file}}`
+
+- Load a file into cache:
+
+`vmtouch -t {{path/to/file}}`
+
+- Evict a file from cache:
+
+`vmtouch -e {{path/to/file}}`
+
+- Lock a file in cache to prevent eviction from memory:
+
+`vmtouch -l {{path/to/file}}`
+
+- Lock a file and daemonize the program:
+
+`vmtouch -ld {{path/to/file}}`