Constructs an instance of QueryFilter with a single condition.
            More conditions can be added after initialization.
            
 Declaration Syntax
 Declaration Syntax| C# | 
public QueryFilter( string attributeName, QueryOperator op, List<AttributeValue> values )
 Parameters
 Parameters- attributeName (String)
- Target attribute name
- op (QueryOperator)
- Comparison operator
- values (List<(Of <(<'AttributeValue>)>)>)
- Attributes to compare