adds issue template to .github dir

.github/issue_template.md

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+## Prerequisites
+
+- [ ] Have you searched for existing issues (open and close) to see if the bug or feature request has already been reported?
+- [ ] If this is a bug report, are you running the latest version of Assemble? If not, please update to the latest version and verify that the issue still occurs before proceding.
+- [ ] Have you read the [Contributing Guide](contributing.md)?
+- [ ] Have you reviewed the project readme (you might find advice about creating new issues)?
+- [ ] Are you creating an issue in the correct repository? (For example, if your issue is related to [grunt-assemble][] or [handlebars-helpers][], you will want to create the issue in that project).
+
+Ready? Great! Please provide the following details:
+
+## version 
+
+[version]
+
+## description
+
+Please decribe the bug or feature, along with:
+
+- [ ] Expected behavior and actual behavior.
+- [ ] Steps to reproduce the problem.
+
+[description]
+
+## error message
+
+```sh
+# please paste any error messages here
+```
+
+## assemblefile.js
+
+```js
+// Please paste contents of assemblefile.js here, or in a gist.
+// Be sure to include any additional comments that might help
+// us resolve the issue.
+```