Added ISSUE_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

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+<!--
+PLEASE HELP US PROCESS GITHUB ISSUES FASTER BY PROVIDING THE FOLLOWING INFORMATION.
+-->
+
+## I'm submitting a…
+<!-- Please check one of the following options with "x" -->
+<pre>
+[ ] Bug
+[ ] Feature Request
+[ ] Other (Please describe in detail)
+</pre>
+
+## Current Behavior
+<!-- Describe the current behavior -->
+
+## Expected Behavior
+<!-- Describe the desired behavior you expect after mitigation of the issue -->
+
+## Reproduction Instructions
+<!--
+For bug reports, please provide detailed instructions on how the bug can be reproduced.
+For feature requests, you can remove this section.
+-->
+
+## Environment
+Output of `i3lock --version`:
+<pre>
+i3lock version: 
+</pre>