upd: issue & PR templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG]"
+labels: Bug
+assignees: ''
+
+---
+
+**Summary**
+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. Observe result
+
+**Observed behavior**
+A clear and concise description of what happened
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots / File Attachments**
+If applicable, add screenshots to help explain your problem or upload files to help us reproduce the bug.
+
+**Platform (please complete the following information):**
+ - OS: [e.g. Windows 10]
+ - App Version: [e.g. 0.13.3]
+
+**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: "[Feature]"
+labels: Feature
+assignees: ''
+
+---
+
+**Summary**
+A clear and concise description of what the problem is.
+
+**Alternatives/Considerations**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context/Motivation**
+Add any other context or screenshots about the feature request here.

.github/PULL_REQUEST_TEMPLATE.md

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+<!--- Provide a general summary of your changes in the Title above -->
+
+## Description
+<!--- Describe your changes in detail -->
+
+## Motivation and Context
+<!--- Why is this change/feature required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here. -->
+
+## Screenshots (if appropriate):
+
+## Types of changes
+<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+
+## Checklist:
+<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
+<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
+- [ ] My code follows the code style of this project.
+- [ ] I have tested my changes and confirmed that they are working