adding container size considerations

Author: khdownie

articles/aks/quotas-skus-regions.md

@@ -38,6 +38,12 @@ Each node in an AKS cluster contains a fixed amount of compute resources such as
 
 For more information on VM types and their compute resources, see [Sizes for virtual machines in Azure][vm-skus].
 
+## Supported container image sizes
+
+AKS doesn't set a limit on the container image size. However, it's important to understand that the larger the container image, the higher the memory demand. This could potentially exceed resource limits or the overall available memory of worker nodes. By default, memory for VM size Standard_DS2_v2 for an AKS cluster is set to 7 GiB.
+
+When a container image is very large (1 TiB or more), kubelet might not be able to pull it from your container registry to a node due to lack of disk space.
+
 ## Region availability
 
 For the latest list of where you can deploy and run clusters, see [AKS region availability][region-availability].