[Tether01] Add Tethering App

This is initial patch that don't contain any service for now.

Bug: 136040414
Test: -build, flash, boot
Change-Id: I0b49d7e9c3fcba5af3025163f9cc9eafb0778116
diff --git a/Tethering/proguard.flags b/Tethering/proguard.flags
new file mode 100644
index 0000000..77fc024
--- /dev/null
+++ b/Tethering/proguard.flags
@@ -0,0 +1 @@
+#TBD