Add documentation for new security features in the Android 4.2 release.
Also, fill in some gaps in some gaps in the Android Security overview, such as
support for VPN and cryptography.
Change-Id: I48fe22ffb7ea94b133ba1b0e0a6586e7a5f18938
diff --git a/src/tech/security/sidebar2.md b/src/tech/security/sidebar2.md
new file mode 100644
index 0000000..a751c77
--- /dev/null
+++ b/src/tech/security/sidebar2.md
@@ -0,0 +1,5 @@
+# Security Topics #
+- [Security Overview](/tech/security/index.html)
+- [Android 4.2](/tech/security/android_4_2_security_enhancements.html)
+
+