templates: Add an issue template for unresponsive maintainers

This is mainly to tag the issues with 'unresponsive-maintainers' so we
can more easily track them.

Change-Id: I429559152e9835f69f7e951fda4dd826b1f77750
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
diff --git a/.github/ISSUE_TEMPLATE/unresponsive_maintainers.md b/.github/ISSUE_TEMPLATE/unresponsive_maintainers.md
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+---
+name: Unresponsive maintainers
+about:
+  Identify a repository where changes are failing to make forward progress as
+  the maintainers are unresponsive.
+title: "Unresponsive maintainers for `<repo>`"
+labels: "unresponsive-maintainers"
+assigness: ""
+---
+
+## Background
+
+See [Subproject Maintainership and Forward Progress][forward-progress].
+
+[forward-progress]:
+  https://github.com/openbmc/docs/blob/master/process/subproject-maintainership.md
+
+## List of links to affected patches in Gerrit