Hi Dominik,
The best way is to use HCP Git repositories!
For example if you have an application in your Web IDE workspace you wish to share with your colleagues, simply deploy it to HCP (right-click -> Deploy -> Deploy to SAP HANA Cloud Platform), you can give it a version and deploy it. Then on HCP a Git repository is created for you and you can share it with your colleagues, who can then clone it in their Web IDE and commit and push their changes.
In the application's page on your HCP cockpit under HTML5 Applications it is really easy to see all the commits and versions of this app.
More information can be found on Web IDE's documentation:
Hope this helps,
Michal.