[ci skip] Add Issue Template

.github/ISSUE_TEMPLATE.md

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+<!-- Instructions: https://github.com/PolymerElements/gold-cc-expiration-input/CONTRIBUTING.md#filing-issues -->
+### Description
+<!-- Example: The `paper-foo` element causes the page to turn pink when clicked. -->
+
+### Expected outcome
+
+<!-- Example: The page stays the same color. -->
+
+### Actual outcome
+
+<!-- Example: The page turns pink. -->
+
+### Live Demo
+<!-- Example: https://jsbin.com/cagaye/edit?html,output -->
+
+### Steps to reproduce
+
+<!-- Example
+1. Put a `paper-foo` element in the page.
+2. Open the page in a web browser.
+3. Click the `paper-foo` element.
+-->
+
+### Browsers Affected
+<!-- Check all that apply -->
+- [ ] Chrome
+- [ ] Firefox
+- [ ] Safari 9
+- [ ] Safari 8
+- [ ] Safari 7
+- [ ] Edge
+- [ ] IE 11
+- [ ] IE 10