Adds SOC code for a particular job title.
     
    
    Usage
    get_soc_code(data, lvl = "soc_3")
 
    
    Arguments
    - data, 
- data.frame or data.table with two columns - joband- value
 
- lvl, 
- string that can take values from - soc_1up to- soc_4
 
 
    
    Value
    data.frame of input data with one extra column named as code