add issue templates (#1533)

* add issue templates

Author: Bertk

.github/ISSUE_TEMPLATE/01-bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG]"
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+Please share a clear and concise description of the problem.
+
+**To Reproduce**
+Please include minimal steps to reproduce the problem if possible. E.g.: the smallest possible code snippet; or a small project, with steps to run it. If possible include text as text rather than screenshots (so it shows up in searches).
+
+**Expected behavior**
+Provide a description of the expected behavior.
+
+**Actual behavior**
+Provide a description of the actual behavior observed. If applicable please include any error messages, exception stacktraces or memory dumps.
+
+**Configuration (please complete the following information):**
+Please provide more information on your .NET configuration:
+    * Which coverlet package and version was used?
+    * 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?
+
+**Additional context**
+Add any other context about the problem here.
+
+> :exclamation:  Please also read [Known Issues](https://github.com/coverlet-coverage/coverlet/blob/master/Documentation/KnownIssues.md)

.github/ISSUE_TEMPLATE/02-blank-issue-template.md

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+---
+name: Blank issue template
+about: Create a report for questions or feature requests
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false