We publish now the vmdk and not OVA/OVF (#46)

* Update upload-rel.sh

* Create ova.md

Documentation/boards/ova.md

@@ -0,0 +1,14 @@
+# OVA
+
+The OVA stay for open virtual appliance. Currently we had remove the ova files and publish a vmdk virtual disk,
+until we have better OVF template to generate our OVA. This vmdk work with (maybe you need convert the disk):
+- HyperV
+- VirtualBox
+- VMware
+
+## Virtual Machine
+
+You can use this vmdk in a virtual machine with follow requirements:
+- UEFI boot
+- min. 1GB RAM
+- 2 vcpu