Add Github issue template + contributing doc (#4)

* Add Github issue template + contributing doc

.github/CONTRIBUTING.md

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+Please read [Contributing to Roots Projects](https://github.com/roots/guidelines/blob/master/CONTRIBUTING.md)

.github/ISSUE_TEMPLATE.md

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+## Submit a feature request or bug report
+
+- [ ] I've read the [guidelines for Contributing to Roots Projects](https://github.com/roots/guidelines/blob/master/CONTRIBUTING.md)
+- [ ] This is a feature request
+- [ ] This is a bug report
+- [ ] This request isn't a duplicate of an [existing issue](https://github.com/roots/sage-woocommerce/issues)
+- [ ] I've read the [docs](https://roots.io/sage/docs) and [NPM Debugging Guidelines post](https://discourse.roots.io/t/npm-debugging-guidelines-failed-npm-install-bower-install-or-gulp-build-read-this/3060) and followed them (if applicable)
+- [ ] This is not a personal support request that should be posted on the [Roots Discourse](https://discourse.roots.io/c/sage) forums
+
+<!-- Replace any `X` with your information. -->
+
+---
+
+**What is the current behavior?**
+
+X
+
+
+**What is the expected or desired behavior?**
+
+X
+
+---
+
+## Bug report
+
+<!-- (delete this section if not applicable) -->
+
+**Please provide steps to reproduce, including full log output:**
+
+X
+
+**Please describe your local environment:**
+
+WordPress version: X
+
+OS: X
+
+NPM/Node version: X
+
+**Where did the bug happen? Development or remote servers?**
+
+X
+
+
+**Is there a related [Discourse](https://discourse.roots.io/) thread or were any utilized (please link them)?**
+
+X
+
+---
+
+## Feature Request
+
+<!-- (delete this section if not applicable) -->
+
+**Please provide use cases for changing the current behavior:**
+
+X
+
+**Other relevant information:**
+
+X