Allow alternative images for specific VIMs in the descriptor

Change-Id: Ic1576aff2a353141438a869617fd9882bec5cf37
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>

diff --git a/Release4/Allow_alternative_images_for_specific_VIMs_in_the_descriptor.md b/Release4/Allow_alternative_images_for_specific_VIMs_in_the_descriptor.md
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+# Allow alternative images for specific VIMs in the descriptor #
+ 
+## Proposer ##
+- Gerardo Garcia (Telefonica)
+- Alfonso Tierno (Telefonica)
+- Francisco Javier Ramon (Telefonica)
+ 
+## Type ##
+**Feature**
+ 
+## Target MDG/TF ##
+IM-NBI, SO, RO
+ 
+## Description ##
+In a hybrid multi-VIM deployment with private and public cloud sites, it would 
+be advisable to allow a different strategy of image management for both types 
+so it is not mandatory to upload images to the public cloud, since:
+- Public cloud often has a set of pre-loaded images (e.g. AWS’s AMIs) that 
+could facilitate their immediate consumption to users.
+- Uploading a big image to public cloud might lead to relevant charges from the 
+cloud provider.
+ 
+Those public cloud images often have their own identifiers, checksums, etc., 
+different from the ones for an image in public cloud.
+ 
+The request is to extend the IM for VNFD so that:
+- The current image reference is interpreted as the default image reference for 
+all VIMs
+- Allow, as option, to include references to alternative images for specific 
+types of VIMs, that would be used for sites of that VIM type instead of the 
+default one.
+ 
+## Demo or definition of done ##
+- Create a VNFD with a VDU that has a default VM image and a specific image for 
+a particular type of VIM (e.g. AWS).
+- Create a NSD that includes the VNF above.
+- Create instances of the NS in 2 different VIM, one of them of the type 
+specified in the VNFD.
+- Check that both of them work properly.