Define diff attribute for java sources

Change-Id: I522c01532911cb0965050119e88e27d75cb35726
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..f57840b
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+*.java diff=java