Is there a documentation for theia/core features which includes information regarding how to create new menu item, or a new menu bar

[original thread by Nitika Sharma]

It’s part of the generated example when you run the code generator. See e.g. https://github.com/TypeFox/theia-xtext-sprotty-example/blob/master/theia/states-dsl/src/browser/states-dsl-contribution.ts and https://github.com/TypeFox/theia-xtext-sprotty-example/blob/d3e4b1358510594bd119934c9aefa82789f85eb9/theia/states-dsl/src/browser/states-dsl-frontend-module.ts#L25 (the first two lines) for the binding

PS: PRs to the Theia doumentation are very welcome! https://gitpod.io/#https://github.com/theia-ide/theia-website