zte's code,first commit

Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/tools/SignImage/test_key/mifi/key b/tools/SignImage/test_key/mifi/key
new file mode 100644
index 0000000..97321cd
--- /dev/null
+++ b/tools/SignImage/test_key/mifi/key
@@ -0,0 +1 @@
+qq›µU,Lϛ_¢
\ No newline at end of file