update: README.md

update: README.md

create: list.png, help.png, echo.png

update: README.md

create: pinghosts.cfg, pingtable.bat

create: tetris.png, battleship.png, tiles.png

update: README.md

create: index.html, script.js, style.css, index.html, script.js, style.css, index.html, script.js, style.css