libaac: Add test code for AAC encoder and decoder

-- unit test code for AAC encoder and decoder.

Change-Id: I6af9030d485dd4151a84f5f4870da4b2c4c45dfa
diff --git a/Android.mk b/Android.mk
new file mode 100644
index 0000000..5c069fe
--- /dev/null
+++ b/Android.mk
@@ -0,0 +1,2 @@
+LOCAL_PATH := $(call my-dir)
+include $(call all-makefiles-under, $(LOCAL_PATH))