Add compilation and run steps

README.md

@@ -1,3 +1,15 @@
 # Pamef
 
-Stuff for PAMEF course in ECN
+Stuff for PAMEF course in ECN
+
+## Compile
+
+You need **GNU Make** to compile this java code easily.
+
+In any folder where there is a makefile, you can run :
+
+Compile with `make`
+
+Run with `make run`
+
+Remove generated files with `make clean`