Add issue templates

Author: garyb

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,10 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+

.github/ISSUE_TEMPLATE/feature-request.md

@@ -0,0 +1,16 @@
+---
+name: Feature request
+about: Suggest types, functions, properties that may be missing
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+### Prerequisites
+
+- [ ] Before opening an issue, please check the DOM standard (https://html.spec.whatwg.org). If it doesn't appear in this spec, it may be present in the spec for one of the other `purescript-web` projects. Although MDN is a great resource, it is not a suitable reference for this project.
+
+### Description
+
+<!-- A summary of the thing to include, with a link to the relevant section of the spec -->

.github/pull_request_template.md

@@ -0,0 +1,7 @@
+### Prerequisites
+
+- [ ] Before opening a pull request, please check the DOM standard (https://dom.spec.whatwg.org/). If it doesn't appear in this spec, it may be present in the spec for one of the other `purescript-web` projects. Although MDN is a great resource, it is not a suitable reference for this project.
+
+### Description
+
+<!-- A link to an existing issue, or a summary of the thing to include with a link to the relevant section of the spec -->

README.md

@@ -3,7 +3,7 @@
 [![Latest release](http://img.shields.io/github/release/purescript-web/purescript-web-html.svg)](https://github.com/purescript-web/purescript-web-html/releases)
 [![Build status](https://travis-ci.org/purescript-web/purescript-web-html.svg?branch=master)](https://travis-ci.org/purescript-web/purescript-web-html)
 
-Type definitions and low level interface implementations for the [W3C HTML5 API](https://www.w3.org/TR/html5).
+Type definitions and low level interface implementations for the [WHATWG HTML Standard](https://html.spec.whatwg.org).
 
 ## Installation