database credits added

Kirill Blazhennov · Kirill Blazhennov · commit c81b611facd7 · 2017-03-01T05:54:41.000-08:00
diff --git a/README.md b/README.md
@@ -1,2 +1,4 @@
 # UCNLSalinity
 UCNL World salinity database tool
+
+Using converted world salinity database data from here:  http://doi.org/10.7289/V5NZ85MT
