The command syntax has changed

This is not markam. Markam would try to figure out that you wanted to
add a url to the database by looking for either `http://' or
`https://' at the start of the first argument, but CLark uses the
`add' command so there should be no confusion.

js/clark.js

@@ -49,7 +49,7 @@ function clark_add_url(I, url, title)
     let tags = yield I.minibuffer.read(
         $prompt="tags (comma delimited): "
     );
-    let command = clark_program + ' "' + url_string + '" "' + title
+    let command = clark_program + ' add "' + url_string + '" "' + title
             + '" "' + description + '" \''
             + tags.split(',').map(function (str)
                                   { return str.trim(); }).join("' '")