Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Local OS (where xxh is installed):**
+**Destination host OS:**
+**xxh version:**
+**xxh-plugins installed:**
+
+**Steps to Reproduce**
+1. I run `xxh ... +v`
+2. The output log:
+3. What is the problem
+
+**For community:**
+⬇️  **Please click the 👍 reaction instead of leaving a `+1` or 👍  comment**

.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.