Added issue template for Az 4.0

Author: dcaro

.github/ISSUE_TEMPLATE/az-preview-bug-report.md

@@ -0,0 +1,67 @@
+---
+name:  Az 4.x preview bug report 
+about: Report errors or unexpected behaviors specifically for the Az 4.0  module in preview
+title: ''
+labels: 'Az 4.x Preview', 'Azure PS Team'
+assignees: ''
+
+---
+
+<!--
+
+- This issue is specifically for reporting issues related to the preview versions of the Az 4.0 PowerShell module
+- Please search the existing issues to see if there has been a similar issue filed
+- For issue related to importing a module, please refer to our troubleshooting guide:
+    - https://github.com/Azure/azure-powershell/blob/master/documentation/troubleshoot-module-load.md
+
+-->
+
+## Description
+
+
+
+## Steps to reproduce
+
+```powershell
+
+```
+
+## Environment data
+
+<!-- Please run $PSVersionTable and paste the output in the below code block -->
+
+```
+
+```
+
+## Module version
+
+<!-- Please run (Get-Module  -ListAvailable) and paste the output in the below code block -->
+
+```powershell
+
+```
+
+## Azure Profile
+
+<!-- Please indicate the selected Azure profile, if any -->
+
+```powershell
+
+```
+
+## Debug output
+
+<!-- Set $DebugPreference='Continue' before running the repro and paste the resulting debug stream in the below code block -->
+
+```
+
+```
+
+## Error output
+
+<!-- Please run Resolve-AzError and paste the output in the below code block -->
+
+```
+
+```