Merge pull request #1988 from postscript-dev/add_git_templates

Add/Update git templates from `old-master`

Author: kmilos

.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 clear and concise description of the bug.
+
+##### **To Reproduce**
+Steps to reproduce the behavior:
+1. Provide the file with which you observed the issue (commonly named PoC)
+2. List the exact commands/functions to reproduce the issue and include any related output
+3. Mention the branch/commit in which you observed the issue (e.g., `main`, `0.27-maintenance`, `commit 9f721b40`)
+
+##### **Expected behavior**
+A short description of what you expected to happen.
+
+##### **Desktop (please complete the following information):**
+- OS and version: (e.g., Linux (Fedora 34), macOS 12, Windows 11)
+- Compiler and version: (e.g., Gcc 11.2, Clang 13.0.0, MSVC 2019)
+- Compilation mode and/or compiler flags:
+
+##### **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: request
+assignees: ''
+
+---
+
+##### **Is your feature request related to a problem?**
+A clear and concise description of the problem (e.g., I'm always frustrated when [...]; Exiv2 does not support XXX format [...])
+
+##### **Describe the solution you would like**
+A short description of what you want to happen.
+
+##### **Describe alternatives you have considered**
+A simple explanation of any alternative solutions or features you have considered.
+
+##### **Additional context**
+Add any other information about the feature request here (e.g. screenshots, URLs).