Create bug_report.md

Author: rcoh

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: 🐛 Bug Report
+about: If something isn't working as expected 🤔.
+
+---
+
+## Bug Report
+<!--
+Thank you for reporting an issue.
+
+Please fill in as much of the template below as you're able.
+-->
+
+### Version
+
+<!--
+List the versions & crates of the aws-rust-sdk you are using.
+
+`cargo install cargo-tree`
+(see install here: https://github.com/sfackler/cargo-tree)
+
+Then:
+
+`cargo tree | grep aws-sdk-`
+-->
+
+### Platform
+
+<!---
+Output of `uname -a` (UNIX), or version and 32 or 64-bit (Windows)
+-->
+
+### AWS Services
+
+<!--
+If relevant, please specify the impacted services. Otherwise, delete this
+section.
+-->
+
+### Description
+
+<!--
+
+Enter your issue details below this comment.
+
+One way to structure the description:
+
+<short summary of the bug>
+
+I tried this code:
+
+<code sample that causes the bug>
+
+I expected to see this happen: <explanation>
+
+Instead, this happened: <explanation>
+-->