README.building.md: Document the process for meta-xilinx

This README.building is derived from the content that was in the README,
it is separated out.

Signed-off-by: Nathan Rossi <nathan@nathanrossi.com>

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+Build Instructions
+==================
+
+The following instructions require OE-Core meta and BitBake. Poky provides these
+components, however they can be acquired separately.
+
+Initialize a build using the `oe-init-build-env` script. Once initialized
+configure `bblayers.conf` by adding the `meta-xilinx` layer. e.g.:
+
+        BBLAYERS ?= " \
+                <path to layer>/oe-core/meta \
+                <path to layer>/meta-xilinx \
+                "
+
+To build a specific target BSP configure the associated machine in `local.conf`:
+
+        MACHINE ?= "zc702-zynq7"
+
+Build the target file system image using `bitbake`:
+
+        $ bitbake core-image-minimal
+
+Once complete the images for the target machine will be available in the output
+directory `tmp/deploy/images/<machine name>/`.
+
+Additional Information
+----------------------
+
+For more complete details on setting up and using Yocto/OE refer to the Yocto
+Project Quick Start guide available at:
+        http://www.yoctoproject.org/docs/current/yocto-project-qs/yocto-project-qs.html
+