Merge pull request #2728 from xonsh/templates

First crack at issue and pr template

.github/issue_template.md

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+<!--- Provide a general summary of the issue in the Title above -->
+<!--- If you have a question along the lines of "How do I do this Bash command in xonsh"
+please first look over the Bash to Xonsh translation guide: http://xon.sh/bash_to_xsh.html
+If you don't find an answer there, please do open an issue! -->
+
+## xonfig
+<!--- Please post the output of the `xonfig` command (run from inside xonsh) so we know more about your current setup -->
+
+## Expected Behavior
+<!--- Tell us what should happen -->
+
+## Current Behavior
+<!--- Tell us what happens instead of the expected behavior -->
+<!--- If part of your bug report is a traceback, please first enter debug mode before triggering the error
+To enter debug mode, set the environment variable `XONSH_DEBUG=1` _before_ starting `xonsh`.  
+On Linux and OSX, an easy way to to do this is to run `env XONSH_DEBUG=1 xonsh` -->
+
+## Steps to Reproduce
+<!--- Please try to write out a minimal reproducible snippet to trigger the bug, it will help us fix it! -->

.github/pull_request_template.md

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+<!--- Thanks for opening a PR on xonsh! Please include a news entry with your PR
+to help keep our changelog up to date! There are instructions available here:
+http://xon.sh/devguide.html#changelog -->
+
+<!--- If there is specific issue / feature request that this PR is addressing,
+please link to the corresponding issue by using the `#issuenumber` syntax.
+Thanks again! -->