chore: add issue templates (crowdin#26)

Author: andrii-bodnar

.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: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. SDK configuration and related code: ...
+2. Go to '...'
+3. Click on '....'
+4. Scroll down to '....'
+5. See an error
+
+> **Tip**
+> [How to create a Minimal, Reproducible Example](https://stackoverflow.com/help/minimal-reproducible-example).
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Environment**
+- Crowdin Flutter SDK: [e.g. 0.2.0]
+- Flutter version: [e.g. 3.10.2]
+- Dart version: [e.g. 2.17.0]
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Smartphone (please complete the following information):**
+ - Device: [e.g. Pixel 5]
+ - OS: [e.g. Android X]
+
+**Additional context**
+Add any other context about the problem here.

.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.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.