This is my first version of a very simple image gallery; it is built to be used in any bootstrap template, if you are not using Bootsrap the gallery will not display properly.
As a first version, I am aware of many limitations, that I hope I will fix/add in the near future.
The way it works:
Create a folder in the media manager, and uploads the pictures that you want to display in the folder.
Once the extension is installed, you need to:
Published
Add a position
Assign on the menu
And specify the folder name and the thumb size in the basic parameter fields.