fix Makefile and README.md for 2006/monge

NOTE: While this code compiled, it did not link.

This code may have been written for sdl-config instread of
sdl2-config.

2006/monge/Makefile

@@ -105,7 +105,7 @@ CDEFINE=
 #CINCLUDE= -include stdlib.h
 #CINCLUDE= -include stdio.h
 #CINCLUDE= -include stdlib.h -include stdio.h
-#CINCLUDE= -I ${X11_INCDIR}
+#CINCLUDE= -I ${X11_INCDIR} -I ${X11_INCDIR}/X11
 CINCLUDE= `${SDL2_CONFIG} --cflags`
 
 # Optimization

2006/monge/README.md

@@ -7,19 +7,25 @@ Pisa
     Italy
     maurizio.monge at gmail dot com
 
+# To build:
 
-## To build:
+Make sure you have the SDL2 development environment installed.
 
-        echo Make sure you have the SDL2 development environment installed
+```sh
-        make all
+make
+```
 
-### To run
+### To run:
 
+```sh
 ./monge expression ...
+```
 
 ### Try:
 
+```sh
 ./monge "z = 0" "z = z*z*z + c; Abs2(z) < 4"
+```
 
 ## Judges' comments