Added issue and pull request templates (#2089)

Author: Fawad Khaliq

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A concise description of what the bug is.
+
+**Steps to reproduce**
+
+**Expected outcome**
+A concise description of what you expected to happen.
+
+**Environment**
+
+* AWS Load Balancer controller version
+* Kubernetes version
+* Using EKS (yes/no), if so version?
+
+**Additional Context**:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem?**
+A description of what the problem is. For example: I'm frustrated when [...]
+
+**Describe the solution you'd like**
+A description of what you want to happen.
+
+**Describe alternatives you've considered**
+A description of any alternative solutions or features you've considered.

.github/PULL_REQUEST_TEMPLATE.md

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+### Issue
+
+<!-- Please link the GitHub issues related to this PR, if available -->
+
+### Description
+
+<!--
+Please explain the changes you made here.
+
+Help your reviewers my guiding them through your key changes,
+implementation decisions etc.
+You can even include snippets of output or screenshots.
+
+A good, clear description == a faster review :)
+-->
+
+### Checklist
+- [ ] Added tests that cover your change (if possible)
+- [ ] Added/modified documentation as required (such as the `README.md`, or the `docs` directory)
+- [ ] Manually tested
+- [ ] Made sure the title of the PR is a good description that can go into the release notes
+
+### BONUS POINTS checklist: complete for good vibes and maybe prizes?! :exploding_head:
+- [ ] Backfilled missing tests for code in same general area :tada:
+- [ ] Refactored something and made the world a better place :star2: