Add issue template (#943)

.github/ISSUE_TEMPLATE.md

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+> If you are reporting a bug, please use the following template.
+
+---
+
+### Bug Report
+> Please answer the following questions for yourself before submitting an issue.
+- [ ] I checked the [documentation](http://dartsim.github.io/) and found no answer.
+- [ ] I checked to make sure that this issue has not already been filed.
+
+#### Environment
+* Select DART version: master / 6.3.0 / other (please specify)
+* Select OS name and version name(or number): Ubuntu 14.04 / macOS Sierra / Windows 10 / other (please specify)
+* Select compiler name and version number: GCC 4.8.5 / Clang 3.9.1 / other (please specify)
+
+#### Expected Behavior
+> Please describe the behavior you are expecting.
+
+#### Current Behavior
+> What is the current behavior?
+> If you have trouble in `cmake` or `make`, it would be very helpful to build DART with verbose option:
+> `$ cmake .. -DDART_VERBOSE=On`
+> `$ make VERBOSE=1`
+> and then dump the results into a [gist](https://gist.github.com/) and share the link to gist here.
+
+#### Steps to Reproduce
+> Please provide detailed steps for reproducing the issue.
+1.
+1.
+1.
+1.
+
+#### Code to Reproduce
+> Please remember that with a working code it's easier to reproduce the bug and it's much faster to fix it.
+> It would be great to fork this repo and create a regression test using [this template](https://github.com/dartsim/dart/blob/master/unittests/regression/test_Issue000Template.cpp).