Cleanup makefile in game Examples

[SkycoinSynth]

Install CX compiler here

• https://github.com/skycoin/cx
• report any errors or problems

Then go to video game directory here

• https://github.com/skycoin/cx-games

Then run each game and determine if there are any problems.

• fix documentation
• report any compiler errors for each game
• if game is using make file; determine if we need the makefile at all and put instructions in readme like "run cx file.cx" etc to run the game without using make file. Also put instructions to build executables from the game. And edit the readme.md . If so the make file can be deleted.
• examine each game and verify if there is a readme.md for each game

Put a make file in the root directory, that compiles all of the games into a bin or build directory.

Put instructions for using the make file into the readme.md in the root folder

Put the bin or build directory into the .gitignore file