chore: add github issue templates

.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: Dimibe
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Information:**
+ - Dart version:
+ - Flutter version:
+ - Platform:
+ - Package version:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Help wanted
+about: Ask a question about grouped_list and it's usage
+title: ''
+labels: help wanted
+assignees: ''
+
+---
+
+