chore(issue): add maintenance template (#1670)

* feat: add maintenance issue_template
* Update maintenance.md

.github/ISSUE_TEMPLATE/maintenance.md

@@ -0,0 +1,20 @@
+---
+name: Maintenance
+about: Suggest an idea for this project
+title: ''
+labels: "\U0001F527 Maintenance"
+assignees: 'kmdrGroch'
+
+---
+
+**Is your maintenance 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.
+
+**Additional context**
+Add any other context or screenshots about the maintenance request here.