[meta] issue template with guidance for bug reports

Author: soryy708

.github/issue_template.md

@@ -0,0 +1,10 @@
+<!-- Reporting a bug? -->
+<!--
+  Please provide the output of running ESLint with this environment variable: `DEBUG=eslint-plugin-import:*`
+  Windows:      `set DEBUG=eslint-plugin-import:* & eslint .`
+  Linux/Mac: `export DEBUG=eslint-plugin-import:* & eslint .`
+
+  It will also be helpful if you can provide a minimal reproducible example
+  Preferably a GitHub repository containing all the code & ESLint config required
+  https://stackoverflow.com/help/minimal-reproducible-example
+-->