Add issues and PR templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**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/custom.md

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+---
+name: Custom issue template
+about: Describe this issue template's purpose here.
+
+---
+

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**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.

.github/pull_request_template.md

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+**IMPORTANT: Please do not create a Pull Request without creating an issue first.**
+
+*Any change needs to be discussed before proceeding. Failure to do so may result in the rejection of the pull request.*
+
+Please provide enough information so that others can review your pull request:
+<!-- You can skip this if you're fixing a typo or adding an app to the Showcase. -->
+
+Explain the **details** for making this change. What existing problem does the pull request solve?
+<!-- Example: When "Adding a function to do X", explain why it is necessary to have a way to do X. -->
+
+**Test plan (required)**
+Demonstrate the code is solid. Example: The exact commands you ran and their output, screenshots / videos if the pull request changes UI.
+<!-- Make sure tests pass on both Travis and Circle CI. -->
+
+**Code formatting**
+<!-- See the simple style guide. -->
+
+**Closing issues**
+Put `closes #XXXX` in your comment to auto-close the issue that your PR fixes (if such).