Create ISSUE_TEMPLATE.md

Author: osipxd

ISSUE_TEMPLATE.md

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+### Prerequisites
+
+* [ ] Are you running the latest version?
+* [ ] Did you check the FAQs on [plugin's page](https://www.spigotmc.org/resources/12498/)?
+* [ ] Did you check the [Wiki](http://rpginventory.endlesscode.ru/)?
+* [ ] Did you configure [config.yml](https://github.com/EndlessCodeGroup/RPGInventory/blob/master/src/main/resources/config.yml)?
+* [ ] Did you perform a cursory search?
+* [ ] Can you reproduce the problem in clean server (with installed only the plugin and dependencies)?
+
+### Description
+
+[Description of the bug or feature]
+
+### Steps to Reproduce
+
+1. [First Step]
+2. [Second Step]
+3. [and so on...]
+
+**Expected behavior:** [What you expected to happen]
+
+**Actual behavior:** [What actually happened]
+
+### Environment
+
+**Server Core:** [Spigot/Paper/etc.]\
+**Server Version:** [e.g. 1.12.2]\
+**Plugin Version:** [e.g. 2.1.4-PRE]
+
+
+***HIGHLY RECOMMENDED TO ATTACH SERVER LOGS TO THE ISSUE!***