Added ISSUE_TEMPLATE

Thanks to https://www.talater.com/open-source-templates/#/

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,38 @@
+<!--- Provide a general summary of the issue in the title above. -->
+
+## Description
+<!--- Provide a more detailed introduction to the issue itself. -->
+<!--- Why you consider it to be a bug or a usefull change/improvement? -->
+
+## Expected Behavior
+<!--- If you're describing a bug, tell us what should happen. -->
+<!--- If you're suggesting a change/improvement, tell us how it should work. -->
+
+## Current Behavior
+<!--- If describing a bug, tell us what happens instead of the expected behavior. -->
+<!--- If suggesting a change/improvement, explain the difference from current behavior. -->
+
+## Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+<!--- or ideas how to implement the addition or change. -->
+
+## Steps to Reproduce (for bugs)
+<!--- Provide a link to a live example, or an unambiguous set of steps to reproduce this bug. -->
+1.
+2.
+3.
+4.
+
+## Context
+<!--- 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. -->
+
+## Your Environment
+<!--- Include as many relevant details about the environment you experienced the bug in. -->
+* CanvasBlocker Version used:
+* Firefox version incl. 32- or 64-bit:
+* Operating System and version (desktop or mobile):
+
+## Your Settings
+<!--- Copy your CanvasBlocker settings (can be retrieved by checking the expert mode -> export settings) here. -->
+<!--- You may consider deleting personal data - especially the "persistentRndStorage". -->