Update issue templates

Introduce templates for issues and feature requests.

Signed-off-by: Sébastien Han <seb@redhat.com>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+<!-- **Are you in the right place?**
+1. For issues or feature requests, please create an issue in this repository.
+2. Did you already search the existing open issues for anything similar? -->
+
+
+**Bug Report**
+
+What happened:
+
+What you expected to happen:
+
+How to reproduce it (minimal and precise):
+<!-- Please let us know any circumstances for reproduction of your bug. -->
+
+Share your group_vars files, inventory
+
+**Environment**:
+* OS (e.g. from /etc/os-release):
+* Kernel (e.g. `uname -a`):
+* Docker version if applicable (e.g. `docker version`):
+* Ansible version (e.g. `ansible-playbook --version`):
+* ceph-ansible version (e.g. `git head or tag or stable branch`):
+* Ceph version (e.g. `ceph -v`):

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**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.