Update README.md

README.md

-# create-thematic-maps
+# Create Thematic Maps
+
+This tool generates thematic maps based on an RQDA database augmented with a catmap table to link categories with each other.
+It reads one RQDA database and produces two complete thematic maps one with all codes and one with the codes omitted. Futhermore, for each theme, on theme map is generated including the codes.
+
+Usage: ```rqda-log -i <RQDA FILE> -o <OUTPUT PATH>```
+
+
+