Update issue templates

Author: merill

.github/ISSUE_TEMPLATE/new-command-request.md

@@ -0,0 +1,20 @@
+---
+name: New Command request
+about: Suggest a new command to be added to cmd.ms
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Proposed name of the new command**
+If this is for a blade within a portal, add the product prefix before the command (e.g. adxxxx).
+
+**Description**
+Title/Description of the command (use the same name shown in the Microsoft portal).
+
+**Category**
+Name of the portal this blade lives in or the service name.
+
+**Url**
+The url this command should redirect to.