Add info about font size in README.md

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 # Dungeon Game
-A small but flexible dungeon crawler written in C. Needs GCC to compile (`__USE_GNU`). Renders directly into the terminal.
+A small but flexible dungeon crawler written in C. Needs GCC to compile (`__USE_GNU`). Renders directly into the terminal using unicode and escape sequences. Enlarge font size to see what's happening ingame better. The game supports changing the font size or window size of the terminal emulator while running.
 
 You can easily create plugins for the game by putting a new folder into plugins/ with the name of your plugin and then compiling your code into a shared library placed inside this folder named "<plugin name>.so" (`-shared -fpic`).
 You might want to include the game.h file from plugins/game/game.h. Have a look into it to see available API. See the existing plugins for examples.