[General] Setting up initial issue and pull request templates.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. 
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Used Software Versions**
+ - Arnold: [e.g. 5.4.0.2]
+ - USD: [e.g. 0.19.11]
+ - Compiler: [e.g. GCC 4.8.5]
+ - OS: [e.g. MacOS 10.15]
+ - Any 3rd-party app: [e.g. Katana-3.2]
+
+**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: ''
+
+---
+
+**Describe the feature you'd like**
+A clear and concise description of what the feature is.
+
+**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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+**Changes proposed in this pull request**
+- 
+- 
+
+**Issues fixed in this pull request**
+Fixes #
+Fixes #
+
+**Additional context**
+Add any other context or screenshots about the pull request here.