Write a real issue template.

ISSUE_TEMPLATE.md

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-CONTRIBUTING.md

ISSUE_TEMPLATE.md

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+<!--
+Thanks for reporting a problem with Airsonic! Please complete all of the
+following sections to make it easier to assist you.
+-->
+
+## Problem description
+
+*Describe your problem here. Describe what you want to happen, and what happens
+if you try to do it.*
+
+### Steps to reproduce
+
+*Describe how somebody else could observe the same behavior you do. If possible,
+include relevant configuration or files that cause the problem. If sharing media
+files, ensure you are legally permitted to share copies!*
+
+1. *Frobnicate the Quux widget*
+2. *Enable the turbo encabulator*
+3. *Wait between 5 and 30 minutes for it to crash*
+
+## System information
+
+ * **Airsonic version**: *the version listed on the About page*
+ * **Operating system**: *the operating system you're running Airsonic on.
+   Linux, what distribution; Windows or Mac, what version?*
+ * **Proxy server**: *if running Airsonic behind a proxy, what server and
+   version? Otherwise,* None
+ * **Client**: *what browser and version you use to access the Airsonic web
+   interface, or the name and version of another app you're using.*
+
+## Additional notes
+
+*Include any extra notes here. Otherwise you may remove this section.*