Create channel.go

/*
     output:
     Read... 0
     Counting...
     0x1172c1e0
     Counting...
     0x1172c2a0
     Counting...
     0x1172c300
     Counting...
     0x1172c330
     Counting...
     0x1172c360
     Read... 1
     Read... 2
     Read... 3
     Read... 4
*/