Git: explicitly declare .csv as text file

Former-commit-id: 90ffbf59b0fbee40f8e4e1e8c52162bf46ceccc6

Author: rmcdermo

.gitattributes

@@ -3,5 +3,9 @@
 # Set the default behavior, in case people don't have core.autocrlf set.
 * text=auto
 
+# Explicitly declare text files you want to always be normalized and converted
+# to native line endings on checkout.
+*.csv text
+
 # Submodules retain attributes of their respective repos
 /Validation/Submodules/* text=auto