README.qemu: Add from meta-yocto as it belongs in core

This piece makes sense in OE-Core after resutrcturing in meta-yocto.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/README.qemu b/README.qemu
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+QEMU Emulation Targets
+======================
+
+To simplify development, the build system supports building images to
+work with the QEMU emulator in system emulation mode. Several architectures
+are currently supported in 32 and 64 bit variants:
+
+  * ARM (qemuarm + qemuarm64)
+  * x86 (qemux86 + qemux86-64)
+  * PowerPC (qemuppc + qemuppc64)
+  * MIPS (qemumips + qemumips64)
+
+Use of the QEMU images is covered in the Yocto Project Reference Manual.
+The appropriate MACHINE variable value corresponding to the target is given
+in brackets.