Readme: improving info

README.md

 # vsop - rpkg for organizing roundwood logging data from vsop and derived sources  
 
-Landbruksdirektoratet is providing statistics for annual industrial roundwood at municipality level in excel sheets, one excel document for each year. 
+The Norwegian "Landbruksdirektoratet"" is providing statistics for annual industrial roundwood sales and corresponding volumes at municipality level (in Norway) in excel sheets, one excel document for each year. 
 https://www.landbruksdirektoratet.no/no/statistikk/skogbruk/tommeravvirkning
 
 SSB provide similar statistics, but some of it only at county level, annual resolution and