Introduce end-of-line normalization

Change-Id: Ia78df87957163ad6dd65b9b72cf539a96e57ddf4
Signed-off-by: Kevin Peng <kevin.peng@arm.com>
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..7c00131
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,5 @@
+* text=auto
+
+# Binary files that should not be normalized
+*.pdf binary
+*.png binary