Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--This is just a template - feel free to delete any and all of it and replace as appropriate.-->
+
+**Description**
+<!--
+* Please share a clear and concise description of the problem.
+* Include minimal steps to reproduce the problem if possible. E.g.: the smallest possible code snippet; or a small repo to clone, with steps to run it.
+* What behavior are you seeing, and what behavior would you expect?
+  -->
+
+**Configuration**
+<!--
+* Which version of .NET is the code running on?
+* What OS and version, and what distro if applicable?
+* What is the architecture (x64, x86, ARM, ARM64)?
+* Do you know whether it is specific to that configuration?
+  -->
+
+**Regression?**
+<!--
+* Did this work in a previous build or release of .NET Core, or from .NET Framework? If you can try a previous release or build to find out, that can help us narrow down the problem. If you don't know, that's OK.
+  -->
+
+**Other information**
+<!--
+* Please include any relevant stack traces or error messages.
+* If you have an idea where the problem might lie, let us know that here. Please include any pointers to code, relevant changes, or related issues you know of.
+  -->

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Issue with ASP.NET Core
+    url:  https://github.com/dotnet/aspnetcore/issues/new/choose
+    about: Please open issues with ASP.NET Core in their repo
+  - name: Issue with .NET Core SDK
+    url:  https://github.com/dotnet/sdk/issues/new/choose
+    about: Please open issues with the .NET Core SDK in their repo
+  - name: Issue with Entity Framework
+    url:  https://github.com/dotnet/efcore/issues/new/choose
+    about: Please open issues with Entity Framework in their repo
+  - name: Issue with Roslyn compiler
+    url:  https://github.com/dotnet/roslyn/issues/new/choose
+    about: Please open issues with the Roslyn compiler in their repo
+  - name: Issue with Windows Forms
+    url:  https://github.com/dotnet/winforms/issues/new/choose
+    about: Please open issues with Windows Forms in their repo
+  - name: Issue with WPF
+    url:  https://github.com/dotnet/wpf/issues/new/choose
+    about: Please open issues with WPF in their repo

.github/ISSUE_TEMPLATE/performance_issue.md

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+---
+name: Performance issue
+about: Report a performance problem or regression
+title: ''
+labels: 'tenet-performance'
+assignees: ''
+
+---
+
+<!--This is just a template - feel free to delete any and all of it and replace as appropriate.-->
+
+**Description**
+<!--
+* Please share a clear and concise description of the performance problem.
+* Include minimal steps to reproduce the problem if possible. E.g.: the smallest possible code snippet; or a small repo to clone, with steps to run it.
+  -->
+
+**Configuration**
+<!--
+(If you are posting Benchmark.NET results, this info will be included.)
+* Which version of .NET is the code running on?
+* What OS version, and what distro if applicable?
+* What is the architecture (x64, x86, ARM, ARM64)?
+* If relevant, what are the specs of the machine?
+  -->
+
+**Regression?**
+<!--
+* Is this a regression from a previous build or release of .NET Core, or from .NET Framework? If you can try a previous release or build to find out, that can help us narrow down the problem. If you don't know, that's OK.
+  -->
+
+**Data**
+<!--
+* Please include any benchmark results, images of graphs, timings or measurements, or callstacks that are relevant.
+* If possible please include text as text rather than images (so it shows up in searches).
+* If applicable please include before and after measurements.
+* There is helpful information about measuring code in this repo [here](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md).
+  -->
+
+**Analysis**
+<!--
+* If you have an idea where the problem might lie, let us know that here.
+* Please include any pointers to code, relevant changes, or related issues you know of.
+* If you don't know, that's OK.
+  -->