Create bug_report.md

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Which addon?**
+<!-- The title of the addon this issue is for. -->
+
+**Describe the bug**
+<!-- A clear and concise description of what the bug is. -->
+
+**To Reproduce**
+<!-- Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error -->
+
+**Expected behavior**
+<!-- A clear and concise description of what you expected to happen.-->
+
+**Screenshots**
+<!-- If applicable, add screenshots to help explain your problem. -->
+
+**System**
+<!-- Those information can be found under the Supervisor page on the System tab. -->
+* Supervisor version: <!--Your Supervisor Version, eg. 209. -->
+* Host system version: <!--Your Home Assistant (former HASSIO) version, eg. HassOS 3.12 -->
+<!-- When using a beta or development version please also specify them here. -->