github: add bug report template

.github/ISSUE_TEMPLATE/001_bug_report.md

@@ -0,0 +1,50 @@
+---
+name: Bug report
+about: Create a report to help improving CANnectivity
+title: ''
+labels: bug
+assignees: ''
+---
+
+## Describe the bug
+<!--
+A clear and concise description of what the bug is.
+
+Please also mention any information which could help others to understand
+the problem you're facing:
+ - What have you tried to diagnose or workaround this issue?
+ - Is this a regression? If yes, have you been able to `git bisect` it to a specific commit?
+ - ...
+-->
+
+## To Reproduce
+<!--
+Steps to reproduce the behavior:
+1. west build -b board\_xyz connectivity/app
+2. west flash
+3. See error ...
+-->
+
+## Expected behavior
+<!-- clear and concise description of what you expected to happen. -->
+
+## Logs and console output
+<!--
+If applicable, add console logs or other types of debug information. Please use copy-and-paste
+(instead of attaching a screenshot) and put a code fence (\`\`\`) before and after, to help explain
+the issue.
+-->
+
+## Environment
+<!-- Please complete the following information: -->
+- Target board: <!-- e.g. `lpcxpresso55s16` -->
+- OS: <!-- e.g. which GNU/Linux distribution, which version of MacOS, which version of Windows -->
+- Toolchain: <!-- e.g Zephyr SDK version x.xx -->
+- CANnectivity Git commit SHA: <!-- e.g. output from `git rev-parse HEAD` under the `cannectivity` reposistory -->
+- Zephyr RTOS Git commit SHA: <!-- e.g. output from `git rev-parse HEAD` under the `zephyr` repository -->
+
+## Additional context
+<!--
+Add any other context that could be relevant to your issue, such as external CAN bus connections,
+custom target configuration, ...
+-->