Update README.md (dotnet#225)

* Update README.md

Add the note on issues.

* Create ISSUE_TEMPLATE

Adding the issue template.

* Update README.md

Fixing dotnet#158

* Responding to PR feedback

ISSUE_TEMPLATE

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+Thanks for your interest in .NET Core. 
+
+Please note that this repo (dotnet/core) is not for filing product issues. Here are some repos where you can file an issue:
+ * dotnet/cli - for CLI tools and questions
+ * dotnet/corefx - for API issues and questions
+ * dotnet/coreclr - for runtime issues
+* nuget/home - for NuGet questions and issues

README.md

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 # .NET Core Home
 
 The core repository is the starting point to engage in and learn about the
-.NET Core stack.
+.NET Core stack. 
+
+> **Note:** please note that this repository is not for filing product issues.
+> If you run into an issue using .NET Core, there are multiple repos where you can 
+> file an issue:
+> * [dotnet/cli](https://github.com/dotnet/cli) - for CLI tools and questions
+> * [dotnet/corefx](https://github.com/dotnet/corefx) - for API issues and questions
+> * [dotnet/coreclr](https://github.com/dotnet/coreclr) - for runtime issues
+> * [nuget/home](https://github.com/nuget/home) - for NuGet questions and issues
+> * [aspnet/home](https://github.com/aspnet/home) - for ASP.NET Core questions and issues.
+> 
+> We will be removing the ability to file issues on this repo in the near future.
 
 ## Get Started
 
 If you're new to .NET Core and have 10 minutes to try it, start here: 
-- [What is .NET Core?](http://dotnet.github.io/about/)
+- [What is .NET Core?](https://www.microsoft.com/net/core/platform)
 - [Get Started with .NET Core on Windows, OSX and Linux](https://www.microsoft.com/net/core)
 
 If you have some more time and want to go deeper: