Add 'How to open an issue' to the README (#33947)

Author: guardrex

.github/ISSUE_TEMPLATE/blank-issue.md

@@ -0,0 +1,24 @@
+---
+name: Doc issue
+about: Create an issue to help us improve
+---
+
+# Before you open an issue
+
+If the issue is with an ASP.NET Core document:
+
+* Do **not** open a new issue using this form.
+* Open the issue using the **Open a documentation issue** link and feedback form at the bottom of the article. 
+
+Using the **Open a documentation issue** link and form to open an issue adds article metadata for tracking, which indicates the article that you're commenting on and pings the author for a faster response.
+
+If the issue is:
+
+* A simple typo or similar correction, you can submit a PR. See [the contributor guide](https://docs.microsoft.com/contribute/#quick-edits-to-existing-documents) for instructions.
+* A general support question, consider asking on a support forum site:
+  * [Stack Overflow](https://stackoverflow.com/questions/tagged/asp.net-core)
+  * [ASP.NET Core Slack](https://aspnetcore.slack.com/join/shared_invite/zt-1mv5487zb-EOZxJ1iqb0A0ajowEbxByQ#/shared-invite/email)
+  * [ASP.NET Gitter](https://gitter.im/aspnet/Home)
+* A site design concern, create an issue at [MicrosoftDocs/Feedback](https://github.com/MicrosoftDocs/Feedback/issues/new/choose).
+* A problem completing a tutorial, compare your code with the completed sample.
+* A duplicate of an open or closed issue, leave a comment on that issue.

README.md

@@ -5,3 +5,23 @@ This repository contains the [ASP.NET Core documentation](https://learn.microsof
 To provide comments and suggestions on [learn.microsoft.com](https://learn.microsoft.com) site functionality, open an issue in the [`MicrosoftDocs/feedback` GitHub repository](https://github.com/MicrosoftDocs/feedback).
 
 ASP.NET 4.x documentation changes are made in the [`dotnet/AspNetDocs` GitHub repository](https://github.com/dotnet/AspNetDocs).
+
+## How to open an issue
+
+If the issue is with an ASP.NET Core document:
+
+* Do **not** open a blank issue.
+* Open the issue using the **Open a documentation issue** link and feedback form at the bottom of the article. 
+
+Using the **Open a documentation issue** link and form to open an issue adds article metadata for tracking, which indicates the article that you're commenting on and automatically pings the author for a faster response.
+
+If the issue is:
+
+* A simple typo or similar correction, you can submit a PR. See [the contributor guide](https://docs.microsoft.com/contribute/#quick-edits-to-existing-documents) for instructions.
+* A general support question, consider asking on a support forum site:
+  * [Stack Overflow](https://stackoverflow.com/questions/tagged/asp.net-core)
+  * [ASP.NET Core Slack](https://aspnetcore.slack.com/join/shared_invite/zt-1mv5487zb-EOZxJ1iqb0A0ajowEbxByQ#/shared-invite/email)
+  * [ASP.NET Gitter](https://gitter.im/aspnet/Home)
+* A site design concern, create an issue at [MicrosoftDocs/Feedback](https://github.com/MicrosoftDocs/Feedback/issues/new/choose).
+* A problem completing a tutorial, compare your code with the completed sample.
+* A duplicate of an open or closed issue, leave a comment on that issue.