Create issue_template.md

Create a template for issues on the conda-build repository, to help users improve the error reports submitted.

.github/issue_template.md

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+<!--
+Thanks for opening an issue! A few things to keep in mind:
+
+- This issue tracker is for issues with or enhancements for conda-build.
+
+For conda issues, you should open an issue at https://github.com/conda/conda/issues
+For Anaconda issues, you should open an issue at https://github.com/ContinuumIO/anaconda-issues/issues
+For an issue with a particular conda-forge package, you should open an issue on the 
+corresponding feedstock: https://github.com/conda-forge
+-->
+
+### Actual Behavior
+
+<!-- What actually happens? -->
+
+### Expected Behavior
+
+<!-- What do you think should happen? -->
+
+### Steps to Reproduce
+
+<!-- Steps to reproduce issue. -->
+
+
+##### `Output of conda info`
+<!-- Between the ticks below, paste the output of 'conda info' -->
+```
+
+```
+