Update README.md

README.md

 I won't have time to work on this project in the forseeable future.
 PR's are still welcome, so feel free to implement new awesome features!
 
+FAQ
+=====================
+
+- What browsers are supported?
+  - A modern browser (Chrome, Firefox, Edge, Safari). The generator has some issues on IE.
+- Cards are generated without icons and background colors, what's wrong?
+  - Enable printing backround images in your browser print dialog
+- I can't find an icon that I've seen on [game-icons.net](http://game-icons.net), where is it?
+  - See the section "updating icons" below.
+- The layout of the cards is broken (e.g., cards are placed outside the page), what's wrong?
+  - Check your page size, card size, and cards/page settings. If you ask the generator to place 4x4 poker-sized cards on a A4 paper, they won't fit and they will overflow the page.
+
 updating icons
 ==============