add Feature Request template [#90]

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+labels: bug
+---
+
+Please be sure to check the existing issues (both open and closed!).
+
+### Issue description
+
+Describe the issue briefly here.
+
+### Expected result
+
+Expected command output and/or code snippets.
+
+### Actual result
+
+Actual command output and/or code snippets.
+
+### Steps to replicate
+
+Provide the command to replicate the bug.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Questions
+    url: https://slack.steeltoe.io/
+    about: Please ask questions on Slack

.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.