A simple double moving average system

# This simple code is describing the double moving average system, thanks for the contribution of Lei and jchang264
# The moving average system is including the SMA(20,60,120) and EMA(20,60,120), which use the different colours and style
# The bar is using the different colours to describe the different state, for example the black one mean the season of the trendy didn't form, the blue mean to reach the first phase of the trendy, the state of gray bar just between the black and blue, The gold one mean the season of the trend has already forming (SMA20 > SMA60 > SMA120), which one I think it is important.
# Price mark mean the deduction price of 20, 60 and 120