📝 Added issue template for contributions

.github/ISSUE_TEMPLATE.md

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+<!--- Remove sections that do not apply -->
+<!--- Advice for the reporter: Please use this template to report bugs or feature requests only. -->
+
+Issues should only be created for bugs, feature requests, or other topics
+related to the **development** of the project. For general questions, please use
+the
+[Discussions](https://github.com/retigra/ZabbixCI/discussions/categories/q-a)
+section.
+
+<!--- Provide a general summary of the issue in the Title above -->
+
+## Expected Behavior
+
+<!--- Tell us what should happen -->
+
+## Current Behavior
+
+<!--- Tell us what happens instead of the expected behavior -->
+
+## Possible Solution
+
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+
+## Steps to Reproduce
+
+<!--- Provide a link to a live example, or an unambiguous set of steps to -->
+<!--- reproduce this bug. Include code to reproduce, if relevant -->
+
+1.
+2.
+3.
+4.
+
+## Context (Environment)
+
+<!--- How has this issue affected you? What are you trying to accomplish? -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world -->
+
+- ZabbixCI version:
+- Zabbix version:
+- Python version:
+
+## Detailed Description
+
+<!--- Provide a detailed description of the change or addition you are proposing -->
+
+## Possible Implementation
+
+<!--- Not obligatory, but suggest an idea for implementing addition or change -->