Add GitHub contribution guidelines

Author: alessfg

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To reproduce**
+Steps to reproduce the behavior:
+1. Deploy NGINX Config role using playbook.yml
+2. View output/logs/configuration on '...'
+3. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Your environment:**
+-   Version of the NGINX Config Role or specific commit
+-   Version of Ansible
+-   Target deployment platform
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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

.github/pull_request_template.md

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+### Proposed changes
+Describe the use case and detail of the change. If this PR addresses an issue on GitHub, make sure to include a link to that issue using one of the [supported keywords](https://docs.github.com/en/github/managing-your-work-on-github/linking-a-pull-request-to-an-issue) here in this description (not in the title of the PR).
+
+### Checklist
+Before creating a PR, run through this checklist and mark each as complete.
+
+-   [ ] I have read the [CONTRIBUTING](https://github.com/nginxinc/ansible-role-nginx-app-protect/blob/main/CONTRIBUTING.md) document
+-   [ ] I have added Molecule tests that prove my fix is effective or that my feature works
+-   [ ] I have checked that all Molecule tests pass after adding my changes
+-   [ ] I have updated any relevant documentation (`defaults/main/*.yml`, `README.md` and `CHANGELOG.md`)