Adds a new issue template (#934)

Why:

* Not everyone read contributing guide so this should improve things slightly.

diff --git a/issue_template.md b/issue_template.md
new file mode 100644 (file)
index 0000000..a033791
--- /dev/null
+++ b/issue_template.md
@@ -0,0 +1,38 @@
+### Precheck
+ 
+* Do a quick search and make sure a bug has not yet been reported;
+* do a quick check if the bug still exists in the latest patch version;
+* finally, be nice and have fun!
+
+### Environment
+
+* clean-css version - `npm ls clean-css`:
+* node.js version - `node -v`:
+* operating system:
+
+### Configuration options
+
+```js
+var CleanCSS = require('clean-css');
+new CleanCSS({
+  // compatibility: 'ie8',
+  // format: 'keep-breaks',
+  // level: 2
+})
+```
+
+### Input CSS
+
+```css
+/* the shorter the better! */
+```
+
+### Actual output CSS
+
+```css
+```
+
+### Expected output CSS
+
+```css
+```