Added issue_template.md

issue_template.md

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+**ArmA Version:** `x.xx`
+*(indicate if stable or dev*)
+
+**ACE3 Version:** `3.x.x`
+*(indicate if stable or dev, if dev indicate the commit the version is based on)*
+
+**Mods:**
+* `@CBA_A3`
+* `@ace`
+
+**Placed Modules:**
+* *Add the list of modules you have placed on the map. Use 'None' if the error occurs without using any modules.*
+
+**Description:**
+* *Add a detailed description of the error. This makes it easier for us to fix the issue.*
+
+**Steps to reproduce:**
+* *Add the steps needed to reproduce the issue.*
+
+**Where did the issue occur?**
+* *A possible answer might be "Dedicated Server", "Local Multiplayer", "Editor", or "Singleplayer"*
+
+**RPT log file:**
+* *Add a link (pastebin.com) to the client or server RPT file.*