Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: I found a bug in Mango!
+title: "[Bug Report]"
+labels: 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.
+
+**Environment (please complete the following information):**
+ - OS: [e.g. Ubuntu 18.04]
+ - Browser [e.g. chrome, safari, if applicable]
+ - Mango Version [e.g. v0.1.0]
+
+**Docker (if you are running Mango in a Docker container)**
+- The `docker-compose.yml` file you are using
+
+**Additional context**
+Add any other context about the problem here. Add screenshots if applicable.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a feature for Mango
+title: "[Feature Request]"
+labels: enhancement
+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.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/general-question.md

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+---
+name: General Question
+about: I have a question about Mango
+title: "[Question]"
+labels: general question
+assignees: ''
+
+---
+
+