Issues templates (#113)

Author: PabloGGaray

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior. Ideally a self-contained snippet of code, or link to a notebook or external code. Please include screenshots/images produced with PyMC-BART here, or the stack trace including `pymc-bart` code to help.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Additional context**
+Versions of `pymc-bart` and other libraries used, operating system used, and anything else that may be useful.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Tell us about it
+
+The more specific the better. 
+
+## Thoughts on implementation
+
+Not required, but if you have thoughts on how to implement the feature, that can be helpful! In case there are academic references, we welcome those here too.

.github/ISSUE_TEMPLATE/usage-question.md

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+---
+name: Usage Question
+about: General questions about PyMC-BART usage
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Short Description
+
+Let us know what you're trying to do and we can point you in the right direction. Screenshots/plots or stack traces that include `pymc-bart` are particularly helpful.
+
+## Code Example or link
+
+Please provide a minimal, self-contained, and reproducible example demonstrating what you're trying to do. Ideally, it will be a code snippet, a link to a notebook, or a link to code that can be run on another user's computer.
+
+Also include the PyMC-BART version and the version of any other relevant packages.
+
+## Relevant documentation or public examples
+
+Please provide documentation, public examples, or any additional information which may be relevant to your question