docs(github): add ISSUE_TEMPLATE.md

Author: remarkablemark

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,36 @@
+<!--
+Is this a bug report?
+├── Yes
+│   └── Continue filling out the template.
+└── No
+    └── Delete the template and write in free form.
+        Please apply a label to the issue (if applicable).
+-->
+
+### Expected behavior
+
+<!-- What should happen. -->
+
+### Actual behavior
+
+<!-- What happens instead. -->
+
+### Steps to reproduce
+
+<!-- Describe a sequence of steps that anybody can repeat to see the issue. -->
+
+### Reproducible demo
+
+<!--
+Creating a bug demo facilitates the resolvement of an issue:
+
+* CodeSandbox: https://codesandbox.io/s/940pov1l4w
+* JSFiddle: https://jsfiddle.net/remarkablemark/7v86d800/
+* repl.it: https://repl.it/@remarkablemark/html-react-parser
+-->
+
+### Environment
+
+- Version:
+- Platform:
+- Browser: