Add an issue template

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,35 @@
+### Basic info:
+
+- **Node.js version:** <!-- only v6 and above are supported -->
+- **jsdom version:** <!-- only v10 and above are supported -->
+
+### Minimal reproduction case
+
+```js
+const { JSDOM } = require("jsdom");
+
+const options = {
+  ... your options here ...
+};
+const dom = new JSDOM(`
+  ... your HTML here ...
+`, options);
+
+... your code that reproduces the problem here, probably using dom.window ...
+```
+
+<!--
+You can also use the old API in your repro case, as long as you are using
+v10 or above
+
+Please create a minimal repro. Any reports involving third party libraries
+will be closed, as we cannot debug third-party library interactions for you.
+
+Please do not use syntax that is not supported in Node.js, such as JSX or
+`import` statements. If we cannot run the code in Node.js, we will close the
+issue, as we cannot debug whatever toolchain you are using.
+-->
+
+### How does similar code behave in browsers?
+
+(Link to a jsbin or similar suggested.)