Add issue templates

Signed-off-by: Tsuyoshi Hombashi <[email protected]>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: needs-triage
+assignees: ''
+
+---
+<!--- Provide a general summary of the issue in the Title above -->
+
+## 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.
+
+
+## Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+<!--- or ideas how to implement the addition or change -->
+
+
+## To Reproduce
+<!--- Provide a link to a live example, or an unambiguous set of steps to -->
+<!--- reproduce this bug. Include code to reproduce, if relevant -->
+
+1. …
+2. …
+3. …
+
+
+## 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 -->
+
+
+## Your Environment
+<!--- Include as many relevant details about the environment you experienced the bug in -->
+* Version used:
+* Operating System and version:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: needs-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
+<!--- 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 -->