Create project page for Android Binder

Signed-off-by: Matt Gilbride <mattgilbride@google.com>

Author: matthewtgilbride

SUMMARY.md

@@ -21,6 +21,7 @@
 ## Users
 
   - [NVMe Driver](NVMe-driver.md)
+  - [Android Binder Driver](Android-Binder-Driver.md)
 
 # Links
 

src/Android-Binder-Driver.md

@@ -0,0 +1,20 @@
+# Android Binder Driver
+
+This project is an effort to rewrite Android's Binder kernel driver in Rust.
+
+## Motivation
+
+Binder is one of the most security and performance critical components of Android.
+Android isolates apps from each other and the system by assigning each app a
+unique user ID (UID).  This is called "application sandboxing", and is a fundamental
+tenet of the [Android Platform Security Model](https://arxiv.org/abs/1904.05572).
+
+The majority of inter-process communication (IPC) on Android goes through Binder.
+Thus, memory unsafety vulnerabilities are especially critical when they happen in the
+Binder driver.
+
+## Maintenance
+
+The Rust driver was originally authored by Wedson Almeida Filho, and is now maintained
+by Alice Ryhl. The ongoing work will be part of the
+[Android Open Source Project](https://source.android.com/).