check_vgfree: Adding new plugin

check_vgfree/README.md

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+# check_vgfree
+Nagios plugin to check free space on LVM volume group
+
+```console
+$ chmod +x check_vgfree
+$ ./check_vgfree --help
+Usage: check_vgfree [options]
+  try: check_vgfree --help
+
+Options:
+  -h, --help            show this help message and exit
+  -c CRITICAL, --critical=CRITICAL
+                        critical size limit
+  -C CP, --critical-percent=CP
+                        % critical limit
+  -g VG, --volume-group=VG
+                        volume group to check
+  -w WARNING, --warning=WARNING
+                        warning size limit
+  -W WP, --warning-percent=WP
+                        % warning limit
+  --units=UNIT          size in these units: (b)ytes, (k)ilobytes,
+                        (m)egabytes, *(g)igabytes (*DEFAULT), (t)erabytes,
+                        (p)etabytes, (e)xabytes
+```