Switch to multiple template

Author: liufengyun

docs/ISSUE_TEMPLATE/bug.md

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+---
+name: "\U0001F41B Bug report"
+about: Report a bug about the Dotty Compiler
+title: ''
+labels: itype:bug
+assignees: ''
+
+---
+
+## minimized code
+
+```Scala
+println("hello, world")
+```
+
+
+## expectation
+
+

docs/ISSUE_TEMPLATE/feature.md

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+---
+name: "\U0001F389 Suggest a feature"
+about: Please create a feature request here https://github.com/lampepfl/dotty-feature-requests
+title: ''
+labels:
+assignees: ''
+
+---
+
+Please create a feature request here: [lampepfl/dotty-feature-requests](https://github.com/lampepfl/dotty-feature-requests).
+
+
+