infra: add issue templates (#181)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: File a report to help us reproduce and fix the problem
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To reproduce**
+A clear, step-by-step set of instructions to reproduce the bug.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots or logs**
+If applicable, add screenshots or logs to help explain your problem.
+
+**System information**
+A description of your system. Please provide:
+- **Toolkit version**:
+- **Framework version**:
+- **Python version**:
+- **CPU or GPU**:
+- **Custom Docker image (Y/N)**:
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Ask a question related to SageMaker
+    url: https://stackoverflow.com/questions/tagged/amazon-sagemaker
+    about: Use Stack Overflow to ask and answer questions about SageMaker
+  - name: Ask a question related to MXNet
+    url: https://discuss.mxnet.io
+    about: Use the MXNet Forum to ask and answer questions about MXNet

.github/ISSUE_TEMPLATE/documentation-request.md

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+---
+name: Documentation request
+about: Request improved documentation
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**What did you find confusing? Please describe.**
+A clear and concise description of what you found confusing. Ex. I tried to [...] but I didn't understand how to [...]
+
+**Describe how documentation can be improved**
+A clear and concise description of where documentation was lacking and how it can be improved.
+
+**Additional context**
+Add any other context or screenshots about the documentation request here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest new functionality for this toolkit
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the feature you'd like**
+A clear and concise description of the functionality you want.
+
+**How would this feature be used? Please describe.**
+A clear and concise description of the use case for this feature. Please provide an example, if possible.
+
+**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.