Add issue templates (#56)

* Add issue templates

* Fix spelling and link errors

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Create a report to help us improve
+labels: bug
+---
+
+# Bug Report
+
+A list of [Grafana](https://www.nuget.org/profiles/Grafana) and
+[OpenTelemetry](https://www.nuget.org/profiles/OpenTelemetry) NuGet packages
+used, for example `Grafana.OpenTelemetry 0.6.0-beta.1`):
+
+*
+
+The .NET runtime version (e.g. `net462`, `net48`, `netcoreapp3.1`, `net6.0`
+etc.). You can find this information in your `*.csproj` file):
+
+* 
+
+## Symptom
+
+A clear and concise description of what the bug is.
+
+**What is the expected behavior?**
+
+What did you expect to see?
+
+**What is the actual behavior?**
+
+What did you see instead?
+
+## Reproduce
+
+Create a self-contained project using the template of your choice, apply the
+minimum required code to result in the issue you're observing.
+
+## Additional Context
+
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest an idea for this project
+labels: enhancement
+---
+
+# Feature Request
+
+Before opening a feature request against this project, consider whether the feature
+should/could be implemented in the [upstream OpenTelemetry .NET components](https://github.com/open-telemetry/opentelemetry-dotnet)
+If so, please [open an issue open-telemetry/opentelemetry-dotnet](https://github.com/open-telemetry/opentelemetry-dotnet/issues/new).
+
+If the feature is relevant for OpenTelemetry implementations of all languages,
+please [open an issue on
+opentelemetry-specification](https://github.com/open-telemetry/opentelemetry-specification/issues/new).
+
+**Is your feature request related to a problem?**
+
+If so, provide a concise description of the problem.
+
+**Describe the solution you'd like:**
+
+What do you want to happen instead? What is the expected behavior?
+
+**Describe alternatives you've considered.**
+
+Which alternative solutions or features have you considered?
+
+## Additional Context
+
+Add any other context about the feature request here.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Create a question to help us improve our knowledge base and documentation
+labels: question
+---
+
+# Question
+
+Use [Github Discussions](https://github.com/grafana/grafana-opentelemetry-dotnet/discussions/new).