Update issue templates

Author: skyzyx

.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: ''
+
+---
+
+> **IMPORTANT:** If you are posting code or output, please make sure you wrap it with [fenced code blocks](https://help.github.com/articles/creating-and-highlighting-code-blocks/) so that it is readable.
+
+#### Description
+
+A clear and concise description of what the bug is.
+
+#### Steps to Reproduce
+
+Steps to reproduce the behavior:
+
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+#### Expected Behavior
+
+A clear and concise description of what you expected to happen.
+
+#### Actual Behavior
+
+A clear and concise description of what you expected to happen.
+
+#### Possible Solutions
+
+If you have already ideas how to solve the issue, add them here. (remove this section if not needed)
+
+#### Environment
+
+Relevant information about your environment.

.github/ISSUE_TEMPLATE/custom.md

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+---
+name: Custom issue template
+about: Describe this issue template's purpose here.
+title: "[???] "
+labels: question
+assignees: ''
+
+---
+
+

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[ENH] "
+labels: enhancement
+assignees: ''
+
+---
+
+> **IMPORTANT:** If you are posting code or output, please make sure you wrap it with [fenced code blocks](https://help.github.com/articles/creating-and-highlighting-code-blocks/) so that it is readable.
+
+####  Is your feature request related to a problem? Please describe.
+
+A clear and concise description of what the problem is (e.g., “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.