Add GitHub issue templates and TROUBLESHOOTING.md (grpc#568)

.github/ISSUE_TEMPLATE/ask_question.md

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+---
+name: Ask a question
+about: Ask a question related to this project
+labels: question
+
+---
+
+<!--
+
+Your question may have already been answered. Please look here first:
+- Documentation: https://docs.microsoft.com/aspnet/core/grpc
+- Troubleshooting: https://docs.microsoft.com/aspnet/core/grpc/troubleshoot
+- StackOverflow, with "grpc" tag: https://stackoverflow.com/questions/tagged/grpc
+
+Issues specific to Grpc.Core (C-core server and client), or code generation with Grpc.Tools should be created at https://github.com/grpc/grpc/issues/new
+
+Make sure you include information that can help us understand your question.
+-->
+
+<!-- Your question below this line. -->

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Report a bug
+about: Create a report to help us improve
+labels: bug
+
+---
+
+<!--
+
+This form is for bug reports and feature requests ONLY!
+For general questions and troubleshooting, please ask/look for answers here:
+- Documentation: https://docs.microsoft.com/aspnet/core/grpc
+- Troubleshooting: https://docs.microsoft.com/aspnet/core/grpc/troubleshoot
+- StackOverflow, with "grpc" tag: https://stackoverflow.com/questions/tagged/grpc
+
+Issues specific to Grpc.Core (C-core server and client), or code generation with Grpc.Tools should be created at https://github.com/grpc/grpc/issues/new
+-->
+
+### What version of gRPC and what language are you using?
+
+
+### What operating system (Linux, Windows,...) and version?
+
+
+### What runtime / compiler are you using (e.g. .NET Core SDK version `dotnet --info`)
+
+
+### What did you do?
+If possible, provide a recipe for reproducing the error. Try being specific and include code snippets if helpful.
+
+### What did you expect to see?
+
+
+### What did you see instead?
+
+Make sure you include information that can help us debug (full error message, exception listing, stack trace, logs).
+
+See [TROUBLESHOOTING.md](https://github.com/grpc/grpc-dotnet/blob/master/TROUBLESHOOTING.md) for how to diagnose problems better.
+
+### Anything else we should know about your project / environment?

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Request a feature
+about: Suggest an idea for this project
+labels: enhancement
+
+---
+
+<!--
+
+This form is for bug reports and feature requests ONLY!
+For general questions and troubleshooting, please ask/look for answers here:
+- Documentation: https://docs.microsoft.com/aspnet/core/grpc
+- Troubleshooting: https://docs.microsoft.com/aspnet/core/grpc/troubleshoot
+- StackOverflow, with "grpc" tag: https://stackoverflow.com/questions/tagged/grpc
+
+Issues specific to Grpc.Core (C-core server and client), or code generation with Grpc.Tools should be created at https://github.com/grpc/grpc/issues/new
+-->
+
+### Is your feature request related to a problem? Please describe.
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+### Describe the solution you'd like
+A clear and concise description of what you want to happen.
+
+### Describe alternatives you've considered
+A clear and concise description of any alternative solutions or features you've considered.
+
+### Additional context
+Add any other context about the feature request here.

TROUBLESHOOTING.md

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+# Troubleshooting gRPC for .NET
+
+This guide is for troubleshooting gRPC for .NET (grpc-dotnet). For issues specific to Grpc.Core (C-core server and client), or code generation with Grpc.Tools, please refer to [TROUBLESHOOTING.md](https://github.com/grpc/grpc/blob/master/TROUBLESHOOTING.md) in `grpc/grpc` repository.
+
+## Troubleshooting documentation
+
+For solutions for commonly encountered problems, see [gRPC troubleshooting](https://docs.microsoft.com/aspnet/core/grpc/troubleshoot).
+
+## Answers on StackOverflow
+
+Your problem might have already been solved on StackOverflow. Search for questions with "grpc" tag: https://stackoverflow.com/questions/tagged/grpc
+
+## Enabling extra logging and tracing
+
+Extra logging can be very useful for diagnosing problems. For documentation on configuring logging in gRPC services and clients, see 
+[Logging and diagnostics in gRPC on .NET](https://docs.microsoft.com/aspnet/core/grpc/diagnostics).