Add icon and license in README

README.md

@@ -2,7 +2,9 @@
 
 Experimental project for map creation with biomes.
 
-# Build
+![Biome box logo](icon.png)
+
+## Build
 
 You need `make` and `SDL1` to build this project.
 
@@ -17,3 +19,7 @@ To execute :
 $ make exec
 ```
 
+## License
+
+GNU GPLv3, see `LICENSE.txt`.
+