An indicator of support and resistance levels

The levels themselves are not calculated, as for example the pivot ones, but are read from the text file of a specific format.

It is necessary to create an individual file "Levels_RS_<symbol name>.csv" for every instrument.

The fomat of the file involves the differnce of strong levels that are displayed on the chart with the thickened lines. I used this indicator to display the levels, that are published by Teletrade, บนแผนภูมิ.