Add issue template

.github/ISSUE_TEMPLATE.md

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+<!--
+
+Please read carefully before submitting a new issue.
+
+For questions or issues regarding how to setup ShadowFox, read first: https://github.com/overdodactyl/ShadowFox/wiki/Getting-Started
+
+For questions regarding customizing webextensions, read first: https://github.com/overdodactyl/ShadowFox/wiki/Altering-webextensions
+
+Please DO NOT include more than one feature request or bug in a single issue.  Use a different issue for every topic.  
+
+If you are reporting a bug or un-styled Firefox feature, please include all relevant info, including:
+
+* browser version (stable, beta, developer, nightly)
+* operating system (mac, windows, linux etc.)
+* explicit instructions how to get to the broken feature/webpage
+* screenshots
+* how you are using ShadowFox (complete userChrome/Content, userChrome/userContent_imports, gulp)
+
+If you are reporting a bug or un-styled webextension feature, please include all relevant info, including:
+
+* webextension name
+* browser version (stable, beta, developer, nightly)
+* operating system (mac, windows, linux etc.)
+* explicit instructions how to get to the broken/unstyled feature or webpage
+* screenshots
+
+If you are submitting a feature request for a webextension, please include all relevant info, including:
+
+* webextension name
+* link to the webextension in the AMO store
+* what needs to be styled (settings in about:addons, popup etc.)
+
+If you are submitting a different feature request, please describe it in as much detail as possible, including why you/others would benefit from it.
+
+The above are simply guidelines, not hard and fast rules.  Please use common sense and provide the relevant info needed to solve a problem or implement a feature request in a quick manner.  
+
+Thanks for reading and contributing to the ShadowFox community!  
+
+-->