Add an issue template

ISSUE_TEMPLATE.md

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+Please [turn debug info on](https://github.com/SonarOpenCommunity/sonar-cxx/wiki/Get-debug-information) and reproduce your issue.
+The debug info in the log file could help to solve or locate the issue.
+
+### Description
+
+Please provide a succinct description of your issue.
+
+### Steps to reproduce the problem
+
+Please provide the steps required to reproduce the problem
+
+1. Step A
+
+2. Step B
+
+If possible then please create a git repository with a repro sample or attach a zip to the issue.
+
+### Expected behavior
+
+Please provide a description of the behavior you expect.
+
+### Actual behavior
+
+Please provide a description of the actual behavior you observe.
+
+### Known workarounds
+
+Please provide a description of any known workarounds.
+
+### LOG file
+
+Any warnings/errors in the LOG file?
+
+### Related information
+
+* cxx plugin version?
+* SonarQube version?