feat(.github): Add issues templates (#61)

Author: hiro-v

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: 'bug: [DESCRIPTION]'
+labels: 'type: bug'
+assignees: ''
+
+---
+
+**Describe the bug**
+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. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS]
+ - Browser [e.g. chrome, safari]
+ - Version [e.g. 22]
+
+**Smartphone (please complete the following information):**
+ - Device: [e.g. iPhone6]
+ - OS: [e.g. iOS8.1]
+ - Browser [e.g. stock browser, safari]
+ - Version [e.g. 22]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/discussion-thread.md

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+---
+name: Discussion thread
+about: Start an open ended discussion
+title: 'Discussion: [TOPIC HERE]'
+labels: ''
+assignees: ''
+
+---
+
+**Motivation**
+
+**Discussion**
+
+**Resources**

.github/ISSUE_TEMPLATE/epic-request.md

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+---
+name: Epic request
+about: Suggest an idea for this project
+title: 'epic: [DESCRIPTION]'
+labels: 'type: epic'
+assignees: ''
+
+---
+
+**Problem**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Success Criteria**
+A clear and concise description of what you want to happen.
+
+**Sub Issues**
+- 
+
+**Additional context**
+Add any other context or screenshots about the epic request here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: 'feat: [DESCRIPTION]'
+labels: 'type: feature request'
+assignees: ''
+
+---
+
+**Problem**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Success Criteria**
+A clear and concise description of what you want to happen.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.