Update issue templates

In reference to #730

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,20 @@
+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+## Bug description 
+<!-- A clear and concise description of what the bug is. -->
+
+## Steps to reproduce
+<!-- Where did you encounter the bug/What code caused the bug to appear? -->
+
+## Expected behavior
+<!-- A clear and concise description of what you expected to happen. -->
+
+## Screenshots
+<!-- If applicable, add screenshots to help explain your problem. -->
+
+## Environment
+<!-- Provide some information about your OS, Browser or mobile device (if applicable). -->

.github/ISSUE_TEMPLATE/custom.md

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

.github/ISSUE_TEMPLATE/discussion.md

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+---
+name: Discussion
+about: Discuss something with us
+
+---
+
+## Description
+<!-- A clear and concise description of what you want to discuss. -->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+## Description 
+<!-- A clear and concise description of what you want to happen. -->
+<!-- Provide sample code, useful information, possible solutions and examples whenever possible. -->