nayuos: Add README.

README.md

+# NayuOS
+
+This is a SlapOS recipe to build Chromium OS. It needs to be put in the <code>/srv/slapgrid/\<part\>/srv/runner/project/slapos/software/</code> directory.
+
+## Requirements
+
+*   sudo and git on the host (for now)
+*   slapuser with sudo rights to execute the cros_sdk scripts (needed to access the chroot environment provided by Chromium OS)
+in /etc/sudoers:
+<pre><code>
+\<slapuser\>       ALL= NOPASSWD: /srv/slapgrid/\<part\>/srv/runner/instance/\<inst_part\>/parts/clone-depot-tools/cros_sdk, /srv/slapgrid/\<part\>/srv/runner/instance/\<inst_part\>/parts/chromiumos/chromite/bin/cros_sdk, /srv/slapgrid/\<part\>/srv/runner/instance/\<inst_part\>/parts/chromiumos/chromite/bootstrap/cros_sdk, /srv/slapgrid/\<part\>/srv/runner/instance/\<inst_part\>/parts/chromiumos/chromite/scripts/cros_sdk.py, /srv/slapgrid/\<part\>/srv/runner/instance/\<inst_part\>/parts/chromiumos/chromite/scripts/cros_sdk.pyc, /srv/slapgrid/\<part\>/srv/runner/instance/\<inst_part\>/parts/chromiumos/chromium/tools/depot_tools/cros_sdk
+</code></pre>
+
+## Input
+In the vifib parameters (softinst\<nb\>.host.vifib.net \> Services \> Parameters):
+
+    * board / ex: peppy, swanky, ... (daisy won't work because of Mali drivers license)
+    * branch / ex: release-R46-7390.B
+
+
+## Output
+The image will be produced in 
+<code>/srv/slapgrid/\<part\>/srv/runner/instance/\<inst_part\>/parts/chromiumos/\<board_name\>.img</code>
+and the logs are in
+<code>/srv/slapgrid/\<part\>/srv/runner/instance/\<inst_part\>/var/log/cros_sources_dl.log</code> and <code>/srv/slapgrid/\<part\>/srv/runner/instance/\<inst_part\>/var/log/cros_build.log</code>
+
+The script that download the sources and build is located in
+<code>/srv/slapgrid/\<part\>/srv/runner/instance/\<inst_part\>/etc/run</code>
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