Created new issue templates

Created some starter templates for issues to try to improve the issue write-ups.

Author: tpotter7

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve TileMill
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Environment: (Note: We are not setup to test on Linux or Windows so help may be slower on those OSs)**
+ - OS & Version: [e.g. MacOS Mojave]
+ - Browser & Version: [e.g. Safari 12.0.3]
+ - Node Version [e.g. v8.15.0] (you can type nvm version at a terminal prompt to find this)
+
+**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.
+
+**Installation Method**
+If this is a problem installing or running TileMill after an installation, please describe the method you used to install TileMill.
+
+**Screenshots and logfile**
+If applicable, add screenshots or a copy of your terminal output to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? If yes, please describe. If no, remove this section.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution or feature that 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/ISSUE_TEMPLATE/infrastructure-enhancement.md

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+---
+name: Infrastructure Enhancement
+about: Describe an enhancement that should be made to the TileMill infrastructure.
+title: ''
+labels: infrastructure
+assignees: ''
+
+---
+
+**Description of the infrastructure enhancement.**
+A clear and concise description of what should be improved/changed.
+
+**Reason for improving this aspect of the infrastructure?**
+A clear and concise description of why this enhancement is needed or a good idea.
+
+**Additional context**
+Add any other context about the request.