Add readme file 'README.create-run-dir'.

DOC/README.create-run-dir

@@ -0,0 +1,19 @@
+# Create a directory under /run at boot
+#
+# see: 
+#    https://serverfault.com/questions/779634/create-a-directory-under-var-run-at-boot
+#    https://www.freedesktop.org/software/systemd/man/tmpfiles.d.html
+
+PHP_USER=www-data
+PHP_GROUP=www-data
+
+mkdir /run/php
+chown ${PHP_USER}:${PHP_GROUP} /run/php
+
+
+# Create at boot time
+#
+cat << EOF >> /etc/tmpfiles.d/php-fpm.conf
+#Type Path            Mode UID         GID          Age Argument
+d     /run/mydaemon   0755 $PHP_USER   $PHP_GROUP   -   -
+EOF