add known bugs

known_bugs/README.md

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+# Known bugs
+
+XO is currently under development and contains various known bugs/limitations.
+
+We will try to list the most important here so that you know what to expect if you try it and that we are planning to fix them :)
+
+## Disks and networks edition in VM view
+
+You can't currently modify disks and networks on a VM. Will be fixed as soon as we can.
+
+## Lack of explicit error messages
+
+Our error messages aren't really explicit. We need to fix that.
+
+## Avoid aborted VM to stays in the template list
+
+Due to the non-atomic process of VM creation in XAPI, if it fails, you'll have a template created with the name of the VM in your template list.
+
+## RAM usage count in global statistic is wrong
+
+But now, global RAM count is "fixed". We need to find why it doesn't work.
+
+## VNC console through NAT
+
+We need to create a VNC proxy in XO-server. Planned.