Create README with build instructions

README.md

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+# Mighty Liners 1
+
+Local fast-pace multiplayer game with vehicles generating walls and launching rockets !
+
+# Build
+
+You need `make` and `SDL1` to build this project.
+
+Example on Ubuntu :
+```sh
+$ sudo apt install make g++ libsdl-dev libsdl-ttf2.0-dev libsdl-mixer1.2-dev
+$ make
+```
+
+To execute :
+```sh
+$ make exec
+```