[#8] Add templates

Signed-off-by: Denis Kirillov <denis@nspcc.ru>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: community, triage
+assignees: ''
+
+---
+
+<!-- Provide a general summary of the issue in the Title above -->
+
+## Expected Behavior
+<!-- If you're describing a bug, tell us what should happen
+     If you're suggesting a change/improvement, tell us how it should work -->
+
+## Current Behavior
+<!-- If describing a bug, tell us what happens instead of the expected behavior
+     If suggesting a change/improvement, explain the difference from current behavior -->
+
+## Possible Solution
+<!-- Not obligatory, but suggest a fix/reason for the bug,
+     or ideas how to implement the addition or change -->
+
+## Steps to Reproduce (for bugs)
+<!-- Provide a link to a live example, or an unambiguous set of steps
+     to reproduce this bug. -->
+
+1.
+
+## Context
+<!-- How has this issue affected you? What are you trying to accomplish?
+     Providing context helps us come up with a solution that is most useful in the real world -->
+
+## Regression
+<!-- Is this issue a regression? (Yes / No)
+     If Yes, optionally please include version or commit id or PR# that caused this regression,
+     if you have these details -->
+
+## Your Environment
+<!-- Include as many relevant details about the environment you experienced the bug in -->
+* Version used:
+* Server setup and configuration:
+* Operating System and version (`uname -a`):

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: community, triage
+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. -->