Merge pull request #418 from Azure/documentation

additional subscription pre-reqs in the documentation

docs/deploy/azure_prereqs.md

@@ -1,6 +1,18 @@
 # Azure Pre-requisites
 
-You need to be owner of your subscription in order to deploy.
+- You need to be owner of your subscription
+- Your subscription need to be registered for NetApp resource provider as explained [here](https://docs.microsoft.com/en-us/azure/azure-netapp-files/azure-netapp-files-register#waitlist)
+- The CycleCloud marketplace image need to be allowed, this is the default unless your subscription have a policy blocking it
+- When using the default configurations in order to build your environment, make sure you have enough quota for :
+  - 5 x Standard_D2s_v3 
+  - 2 x Standard_D8d_v4 
+  - 2 x Standard_D32d_v4
+- For the compute and visualization nodes, you can adjust the maximum quota in your configuration file but make sure you have quota for these instances :
+  - Standard_F2s_v2
+  - Standard_HC44rs
+  - Standard_HB60rs
+  - Standard_HB120rs_v2
+  - Standard_NV6
 
 ## Packer
 Packer needs a Service Principal Name to deploy resources in your subscription