This is a vdockPlugin contains markdown snippets for cloud9 ide. This plugin comes with for vdock tool.

From Cloud9 menu(top-left corner); select menu-option Open Your Init Script to open init.js. Now add below content to init.js

services.pluginManager.loadPackage([
    "https://techtaste.me/vdockPlugin/c9build/package.vdockPlugin.js",
]);

Open Cloud9 menu and click on Restart cloud9(short cut: command + R for mac)

Note: You have to Restart cloud9 each time a new snippet file is added or edited old file(s) for changes to take affect.

ReferHere to know how to create cloud9-snippets files.