on right click on sign:
    line 1 of clicked block is "&6&l==============="
    line 2 of clicked block is "&aClick Here!"
    line 3 of clicked block is "&bGive Diamond"
    line 4 of clicked block is "&6&l==============="
    execute console command "/give %player% diamond 5 0 {display:{Name:"§b§l看板からもらったダイヤ"}}"