Link to the getting started with Acer doc

Change-Id: I94c72364902925a048300f8c50a689d2e70bc4d3

README.md

@@ -9,3 +9,7 @@ This repository contains documentation for Fuchsia.
 
     Magenta is the microkernel underlying the rest of Fuchsia. Magenta
     also provides core drivers and Fuchsia's libc implementation.
+
+# How do I?
+
++ [How do I use Magenta on my Acer Switch Alpha 12?](https://fuchsia.googlesource.com/magenta/+/master/docs/targets/acer12.md)