README: Add some basic documentation

README.md

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+Inf/IX
+======
+
+Embedded Linux distribution built on [Buildroot][Buildroot] and
+[Finit][Finit].
+
+
+Hardware
+--------
+
+### aarch64
+
+By default, Inf/IX builds with support for the following boards (you
+may enable additional boards in the config, of course):
+
+- Marvell CN-9130 CRB
+- Microchip SparX-5i PCB135 (eMMC)
+
+See the aarch64 specific [documentation](board/aarch64/README.md) for more
+information.
+
+### amd64
+
+Primarily intended to be run under QEMU.
+
+
+QEMU
+----
+
+A virtualized instance can easily be launched by issuing `make run`.
+
+Some settings, e.g. networking, can be configured via `make
+menuconfig` under `External options -> QEMU virtualization`.
+
+[Buildroot]: https://buildroot.org/
+[Finit]: https://github.com/troglobit/finit

board/aarch64/README.md

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+aarch64
+=======
+
+Microchip SparX-5i PCB135 (eMMC)
+--------------------------------
+
+At present, only FIT images are supported via the SparX-5i eval
+board's U-Boot, which must contain a valid load address. If you are
+using this board, after selecting your base configuration, run the
+following command to supplement the existing config with the required
+FIT options:
+
+    make board-enable-sparx-fit
+