Added migration for clientside redirects

ref #3

migrations/20210925182457_clientside_redirect.js

@@ -0,0 +1,9 @@
+exports.up = function(knex) {
+    return knex.schema.table('urls', function (table) {
+        table.boolean('clientside').defaultTo(false);
+    });
+};
+
+exports.down = function(knex) {
+  
+};