Create a new issue template (#1430)

Create a new issue template

.github/ISSUE_TEMPLATE.md

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+Thanks for stopping by to let us know something could be better!
+
+Please run down the following list and make sure you've tried the usual "quick fixes":
+
+  - Search the issues already opened: https://github.com/GoogleCloudPlatform/gcloud-node/issues
+  - Search StackOverflow: https://stackoverflow.com/questions/tagged/gcloud-node
+  - Check our Troubleshooting guide: https://googlecloudplatform.github.io/gcloud-node/#/docs/guides/troubleshooting
+  - Check our FAQ: https://googlecloudplatform.github.io/gcloud-node/#/docs/guides/faq
+
+If you are still having issues, please be sure to include as much information as possible:
+
+#### Environment details
+
+  - OS: 
+  - Node.js version: 
+  - npm version: 
+  - gcloud-node version: 
+
+#### Steps to reproduce
+
+  1. require `gcloud-node`
+  2. ?
+
+Making sure to follow these steps will guarantee the quickest resolution possible.
+
+Thanks!