Add .gitattributes for consistent eol handling

.gitattributes

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+# 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.
+*.java text
+*.gradle text
+*.md text
+*.properties text
+*.xml text
+
+# Declare files that will always have CRLF line endings on checkout.
+#*.sln text eol=crlf
+
+# Denote all files that are truly binary and should not be modified.
+#*.png binary
+#*.jpg binary