v3 - main to cut out

.github/ISSUE_TEMPLATE/ISSUE_TEMPLATE.md

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+---
+name: "\U0001F41E Bug"
+about: File a bug/issue
+title: "[BUG] <title>"
+labels: ''
+assignees: ''
+
+---
+
+<!--
+Note: Please search to see if an issue already exists for the bug you encountered.
+-->
+
+### Environment:
+<!-- linux? windows? or Mac?
+Example:
+- OS: Ubuntu 20.04 -->
+
+### Physical Memory Capacity:
+<!-- 8G or above is better -->
+
+### Docker Image:
+<!-- Did you pull the docker image before execute docker images -->
+
+### Code Version:
+<!-- Did you pull code from github? Make sure the code is up to date-->
+
+### Component installation:
+<!-- Has etcd, mysql, mongodb, redis or Kafka been installed on the server before Open-IM-Server deployment-->
+
+
+### Log File:
+<!-- view log file(logs/openIM.log) content. -->
+
+
+### screenshot:
+<!---->