Merge pull request #927 from tldr-pages/quota

add quota.md (fixes #832)

pages/common/quota.md

@@ -0,0 +1,23 @@
+# quota
+
+> Display users' disk space usage and allocated limits.
+
+- Show disk quotas for the current user:
+
+`quota`
+
+- Verbose output (also display quotas on filesystems where no storage is allocated):
+
+`quota -v`
+
+- Quiet output (only display quotas on filesystems where usage is over quota):
+
+`quota -q`
+
+- Print quotas for the groups of which the current user is a member:
+
+`quota -g`
+
+- Show disk quotas for another user (must be superuser to do this):
+
+`sudo quota -u {{username}}`