Include Issue Template (#819)

ISSUE_TEMPLATE.md

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+<!-- Welcome to the issues section if it's your first time! -->
+
+### Before creating an issue, please ensure:
+- [ ] This is a bug in the software that resides in this repository, and not a
+      support matter (use https://otland.net/forums/otclient.494/ for support)
+- [ ] This issue is reproducible without changes to the code in this repository
+
+### Steps to reproduce (include any configuration/script required to reproduce)
+1.
+2.
+3.
+
+### Expected behaviour
+<!-- Tell us what should happen -->
+
+### Actual behaviour
+<!-- Tell us what happens instead -->
+
+### Environment
+<!-- Please tell which client version are you using (E.g 10.98 OTClient 0.6.6)
+If the issue is environment specific (e.g. compiling errors), include
+     name and version of the operating system and compiler you are using. -->