Add GitHub issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug and help us to improve Serilog.Sinks.OpenTelemetry
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+The Serilog maintainers want you to have a great experience using Serilog.Sinks.OpenTelemetry, and will happily track down and resolve bugs. We all have limited time, though, so please think through all of the factors that might be involved and include as much useful information as possible 😊.
+
+ℹ If the problem is caused by a sink or other extension package, please track down the correct repository for that package and create the report there: this tracker is for the **Serilog.Sinks.OpenTelemetry** package only.
+
+**Description**
+What's going wrong?
+
+**Reproduction**
+Please provide code samples showing how you're configuring and calling Serilog to produce the behavior.
+
+**Expected behavior**
+A concise description of what you expected to happen.
+
+**Relevant package, tooling and runtime versions**
+Which package versions are you using, on what platform?
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: Ask for help
+    url: https://github.com/serilog/serilog/wiki/Usage-help
+    about: Ask the community for help on how to use Serilog

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an improvement to Serilog.Sinks.OpenTelemetry
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. `When [...], it would be great if [...]`.
+
+**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 or screenshots about the feature request here.