Adds issue template (fixes #66)

* adds first version of issue template to help users file issues or avoid filing issues altogether (if possible)

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,28 @@
+#### Requirements
+
+If you are **not** sure whether or not what you are reporting is actually an issue **or** you have a general question please message in the [Gitter Chat Room](https://gitter.im/ryanoasis/nerd-fonts)
+
+By posting an issue you acknowledge the following:
+
+- [ ] A brief but descriptive _title_ of your issue
+- [ ] I have searched the [issues](https://github.com/ryanoasis/nerd-fonts/issues) for my issue and found nothing related and/or helpful
+- [ ] I have read or at least glanced at the [FAQ](https://github.com/ryanoasis/nerd-fonts#faq--troubleshooting)
+- [ ] I have read or at least glanced at the [Wiki](https://github.com/ryanoasisnerd-fonts/wiki)
+
+These items you must provide answers to. Make sure to add **all the information needed to understand the issue** so that someone can help. If the info is missing we'll add the 'Needs more information' label and _may_ choose to close the issue until there is enough information.
+
+**^ ----- Please remove all of the above _and_ this line before posting your issue ----- ^**
+
+#### Subject of the issue
+
+_Describe issue here_
+
+#### Your Setup
+
+- _Which font are you using (e.g. `Anonymice Powerline Nerd Font Complete.ttf`)?_
+- _Which terminal emulator are you using (e.g. `iterm2`, `urxvt`, `gnome`, `konsole`)?_
+- _Are you using OS X, Linux or Windows? And which specific version or distribution?_
+
+#### Optional
+
+- _Provide **screenshots** where appropriate_