How to add a new menu entry and sub menu when I right-click a project.

I'm using and targeting VS 2015.

I want to be able to right-click on a project and (if certain things are true) see a new entry in the project's context menu, much like we see already for "Analyze".

Like "Analyze" I want a sub-menu to appear with several additional entries that I can click to perform actions, just like we'd do with "Analyze -> Calculate Code Metrics" etc.

I've read over some of the VSIX docs/articles but they seem to assume we'll be adding to the VS main menu bar rather than a context menu, like "Analyze" I want this to appear on the context menu but NOT the main VS Project menu.

Any guidance appreciated!

Thx