kml.pl: add usage

kml.pl

@@ -94,6 +94,21 @@ sub USAGE
 {
     my $code = shift;
     say "USAGE: ";
+    say "";
+    say "kml.pl add <name> <coordinates>";
+    say "";
+    say "  Adds a new placemark to ours.kml for <name> at <coordinates>.";
+    say "  The name will automatically link to <name> page on https://jackpoint.obscuritus.ca/";
+    say "";
+    say "";
+    say "kml.pl set <name> <coordinates>";
+    say "";
+    say "  Sets the coordinates of the <name> placemark to <coordinates>.";
+    say "";
+    say "";
+    say "kml.pl remove <name>";
+    say "";
+    say "  Removes the <name> placemark";
     exit($code || 0);
 }
 sub add_empty_child