Add a couple of shared libraries - services, shared

The services library will contain platform components that we want
partners to not customize or ones we want to update faster than the
platform.

The shared library will contain code that we commit to be available
on the device which apps can load if they so desire.

bug:25450378

Change-Id: Iaebb68129a13af9e03e25ea198764d382ad49404
diff --git a/packages/ExtShared/proguard.proguard b/packages/ExtShared/proguard.proguard
new file mode 100644
index 0000000..e5dfbe1
--- /dev/null
+++ b/packages/ExtShared/proguard.proguard
@@ -0,0 +1,7 @@
+-keepparameternames
+-keepattributes Exceptions,InnerClasses,Signature,Deprecated,
+                SourceFile,LineNumberTable,*Annotation*,EnclosingMethod
+
+-keep public class * {
+    public protected *;
+}