Please add the new feature to documentation of Smart meter interface examples : DDM18SD Power meter

[digimp]

@ re PR: arendst/tasmota#

Please add the new feature to the appropriate article in Tasmota documentation

;This script, based on tasmota scripting language, is to read data on a unsupported DDM18SD 
;power meter. It has a 8E1 parity and the slave ID address is n 5.
;On a Nodemcu or Wemos D1 board, put wires between GPIO3 and GPIO1 to the RX and 
;TX pinout of a RS485 to TTL board, but leave empty (none) the GPIO Tasmota software settings. 
;A & B connected to the meter pinout. 
;digimp
>B  
->sensor53 r
>M 1  
+1,3,M,0,9600,DDM,1,2,05040000,05040008,05040012,0504001A,05040036,0504002A,05040100,05040400
1,050404ffffffff@i0:1,Tensione,V,DDM_Voltage,2  
1,050404ffffffff@i1:1,Corrente,A,DDM_Current,2  
1,050404ffffffff@i2:1,Consumo Ist.,W,DDM_Power,2
1,050404ffffffff@i3:1,Reactive power,Var,DDM_React_Power,2
1,050404ffffffff@i4:1,Frequenza,Hz,DDM_Frequency,2 
1,050404ffffffff@i5:1,Power factor,,DDM_PF,2
1,050404ffffffff@i6:1,Consumi tot.,Kwh,DDM_Tot_Power,2
1,050404ffffffff@i7:1,Tot. react. power,Kvarh,DDM_Reac_Power,2
#```