Add .gitattributes to embed standard IN the repo

That file will avoid users to file PR with wrong newline encoding.
I've tried to declare what seemed to be the most common extensions. It's
not strictly required, since the first line and the Git integrated
heurisitics would work just fine in general. But we're just adding a bit
more info here to lower chances to screw up.

.gitattributes

@@ -0,0 +1,39 @@
+# Handle line endings automatically for files detected as text
+# and leave all files detected as binary untouched.
+* text=auto
+
+#
+# The above will handle all files NOT found below
+#
+# These files are text and should be normalized (Convert crlf => lf)
+*.css           text
+*.groovy        text
+*.htm           text
+*.html          text
+*.java          text
+*.js            text
+*.json          text
+*.jelly         text
+*.jellytag      text
+*.less          text
+*.properties    text
+*.rb            text
+*.sh            text
+*.txt           text
+*.xml           text
+
+# These files are binary and should be left untouched
+# (binary is a macro for -text -diff)
+*.class         binary
+*.gz            binary
+*.tgz           binary
+*.ear           binary
+*.gif           binary
+*.hpi           binary
+*.ico           binary
+*.jar           binary
+*.jpg           binary
+*.jpeg          binary
+*.png           binary
+*.war           binary
+*.zip           binary