Add KeyPairGenerator for Android keystore

This allows end-users to generate keys in the keystore without the
private part of the key ever needing to leave the device. The generation
process also generates a self-signed certificate.

Change-Id: I114ffb8e0cbe3b1edaae7e69e8aa578cb835efc9
diff --git a/keystore/java/android/security/package.html b/keystore/java/android/security/package.html
new file mode 100644
index 0000000..610cbf0
--- /dev/null
+++ b/keystore/java/android/security/package.html
@@ -0,0 +1,9 @@
+<HTML>
+<BODY>
+  <p>Provides access to a few facilities of the Android security
+    subsystems.</p>
+  <p>For information on how to use this facility, see the <a
+      href="{@docRoot}guide/topics/security/keystore.html">Android
+      KeyStore facility</a> guide.</p>
+</BODY>
+</HTML>
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