Update README.md

Author: iteratorlee

README.md

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 # Android_OS_Labs
 Linux kernel hacking based on Android 6.0
+
+# Introduction
+Four labs included:
+- Add a color to every process and forbid communication between two processes
+which have different colors using Binder of Android.
+- Implement a task manager in kernel level.
+- Implement a shared memory in kernel level.
+- Implement a cloud file system.