add various issue templates (#46)

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: '[Bug report]'
+labels: bug
+
+---
+**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 information**
+> Add any other information about the problem here.

.github/ISSUE_TEMPLATE/feature-suggestion.md

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+---
+name: Feature suggestion
+about: Create a feature request or suggest improvements to the current project
+title: '[Feature suggestion]'
+labels: enhancement
+
+---
+**Motivation**
+> Describe the need or frustration that motivated you to make this suggestion.
+
+**Suggested Solution**
+> Describe your suggested solution to the need or frustration that you are experiencing.
+
+**Alternatives**
+> Describe any alternative solutions or features you considered and why you believe your suggested
+solution is preferable.
+
+**Additional Information**
+> Provide any additional information that you believe may help us evaluate your suggestion.
+

.github/PULL_REQUEST_TEMPLATE.md

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+**Pull Request Summary**
+
+> Describe what changes this pull request makes to the repository
+
+**Check list**
+- [ ] contains breaking changes
+- [ ] adds new feature
+- [ ] modifies existing feature (bug fix or improvements)
+- [ ] relies on other tasks
+- [ ] documentation changes
+
+**This pull request makes the following changes:**
+
+**Adds**
+- (ex: Add feature A)
+
+**Fixes**
+- (ex: Fix validation function)
+
+**Changes**
+- (ex: Change document B)
+
+**To-dos**
+> *Feel free to remove this section if it's not applicable
+
+- [ ] (ex: add user list)