[gnome-continuous-yocto/gnomeostree-3.28-rocko: 7732/8267] README.qemu: Add from meta-yocto as it belongs in core

[Emmanuele Bassi <ebassi src gnome org>]

commit 663c343d40e20af2ba97c3d9a56dafbb3ade316d
Author: Richard Purdie <richard purdie linuxfoundation org>
Date:   Thu Sep 14 12:39:26 2017 +0100

    README.qemu: Add from meta-yocto as it belongs in core
    
    This piece makes sense in OE-Core after resutrcturing in meta-yocto.
    
    (From OE-Core rev: d72d116e0228cc0e4391d0558b2d32c3fd5e399c)
    
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 README.qemu |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)
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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.