docs: Issue templates for bug and feature requests (aws#726)

.github/ISSUE_TEMPLATE/Bug_report.md

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+---
+name: Bug report
+about: Create an Issue to report a bug
+---
+
+<!-- Make sure we don't have an existing Issue that reports the bug you are seeing (both open and closed). 
+If you do find an existing Issue, re-open or add a comment to that Issue instead of creating a new one. -->
+
+### Description
+
+Briefly describe the bug you are facing.
+
+### Steps to reproduce
+
+Provide steps to replicate.
+
+### Observed result
+
+Please provide command output with `--debug` flag set.
+
+### Expected result
+
+Describe what you expected.
+
+### Additional environment details (Ex: Windows, Mac, Amazon Linux etc)
+
+1. OS:
+2. `sam --version`:
+
+`Add --debug flag to command you are running`

.github/ISSUE_TEMPLATE/Feature_request.md

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+---
+name: Feature request
+about: Suggest an idea/feature/enhancement
+---
+
+<!-- Make sure we don't have an existing Issue that reports the bug you are seeing (both open and closed). -->
+
+### Describe your idea/feature/enhancement
+
+Provide a clear description. Ex. I wish SAM CLI would [...]
+
+### Proposal
+
+Add details of how to add this to the product.
+
+Things to consider:
+1. Will this require any updates to the [SAM Spec](https://github.com/awslabs/serverless-application-model)
+
+### Additional Details