<put algortithm description here>
<put parameter description here>
Default: (not set)
<put parameter description here>
Options:
Default: 0
<put parameter description here>
Default: 10
<put parameter description here>
Default: 0
processing.runalg('qgis:addfieldtoattributestable', input_layer, field_name, field_type, field_length, field_precision, output_layer)