Add / edit items

[cigolpl]

We should have add / edit items functionality in the dashboard:

In the beginning we can use:

https://codemirror.net/demo/folding.html https://github.com/angular-ui/ui-codemirror for JSON format as it will allow us create it fast.

In the future we can consider forms generation i.e. with: http://angular-formly.com/

[cigolpl]

added #6 codemirror but there is still missing edit / add functionality.