Update GitHub issue templates (Azure#235)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,35 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. 
+2. 
+3. 
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Any relevant environment information**
+ - OS: [e.g. Ubuntu, Windows]
+ - Azure CLI/PowerShell/SDK version
+ - Docker version
+ - Datetime (UTC) when the issue occurred
+ - Registry and image names
+
+**Additional context**
+Add any other context about the problem here.
+
+If any information is a concern to post here, you can create a [support ticket](https://azure.microsoft.com/en-us/support/create-ticket/) or send an email to [email protected].

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for the Azure Container Registry
+title: ''
+labels: feature-request
+assignees: ''
+
+---
+
+**What is the problem you're trying to solve**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.