Update issue templates (#5)

* Updated issue templates

Structured input for users submitting bugs, features, doc changes w/ GH Issues queue

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+labels: bug
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Environment**
+Include all relevant environment information:
+1. OS [e.g. Ubuntu 18.04]:
+2. Python version [e.g. 3.7]:
+3. Sparsify version or commit hash [e.g. 0.1.0, `f7245c8`]:
+4. ML framework version(s) [e.g. torch 1.7.1]:
+5. Other Python package versions [e.g. SparseZoo, DeepSparse, numpy, ONNX]:
+6. Other relevant environment information [e.g. hardware, CUDA version]:
+
+**To Reproduce**
+Exact steps to reproduce the behavior:
+
+
+**Errors**
+If applicable, add a full print-out of any errors or exceptions that are raised or include screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here. Also include any relevant files.

.github/ISSUE_TEMPLATE/doc-edit.md

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+---
+name: Doc edit
+about: Propose changes to project documentation
+labels: documentation
+
+---
+
+**What is the URL, file, or UI containing proposed doc change**
+Where does one find the original content or where would this change go?
+
+**What is the current content or situation in question**
+Copy/paste the source content or describe gap.
+
+**What is the proposed change**
+Add new content.
+
+**Additional context**
+Add any other context about the change here. Also include any relevant files or URLs.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+labels: enhancement
+
+---
+
+**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.
+
+**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.