Add .gitattributes file to normalize line endings

.gitattributes

@@ -0,0 +1,20 @@
+# Set default behaviour, in case users don't have core.autocrlf set.
+* text=auto
+
+# Explicitly declare text files we want to always be normalized and converted 
+# to native line endings on checkout.
+*.c text
+*.h text
+*.cpp text
+*.ino text
+*.txt text
+*.brd text
+*.sch text
+
+# Declare files that will always have CRLF line endings on checkout.
+*.sln text eol=crlf
+*.vcxproj eol=crlf
+
+# Denote all files that are truly binary and should not be modified.
+*.png binary
+*.jpg binary