Add standard issue/feature templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+<!-- Feel free to remove sections marked optional if they are not relevant. The other sections please fill out. See also https://github.com/Mathics3/mathics-core/blob/master/REPORTING-BUGS.md -->
+
+## Description
+
+<!-- Please add a clear and concise description of the bug. Try to reduce the bug to the minimum expression that exhibits the bug.
+     For example, if an an expression occurs with several terms, can these be removed and the bug still appears? If so
+	 we would like the reduced, simpler expression.
+-->
+
+## How to Reproduce
+
+<!--
+Steps to reproduce the behavior.
+-->
+
+## Output Given
+
+<!--
+Please include not just the error message but all output leading to the message which includes echoing input and messages up to the error.
+For a command-line environment include command invocation and all the output produced.
+
+If this is too long, then try narrowing the problem to something short.
+-->
+
+
+## Expected behavior
+
+<!-- Add a clear and concise description of what you expected to happen. -->
+
+## Your Environment
+
+<!-- _This information can be helpful..
+
+**All: Mathics version, Installed Python Python packages.
+
+In addition
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS]
+ - Browser [e.g. chrome, safari]
+
+**Smartphone (please complete the following information):**
+ - Device: [e.g. iPhone6]
+ - OS: [e.g. iOS8.1]
+ - Browser [e.g. stock browser, safari]
+
+If you are using a command-line interface the relevant information is posted when you enter the mathics or mathicsscript.
+
+If you are using Django http://localhost/about provides this information which you can cut and paste.
+ -->
+
+## Workarounds
+
+<!-- If there is a workaround for the problem, describe that here. -->
+
+## Priority
+
+<!-- If this is blocking some important activity let us know what activity it blocks. -->
+
+## Additional context
+
+<!--
+This is optional. Please add any other context about the problem here or special environment setup.
+-->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+*Note: If the feature is about adding or filling out an existing deficiency in the Mathics3 language, please file this as an [issue](https://github.com/Mathics3/mathics-core/issues/new?assignees=&labels=&projects=&template=bug_report.md&title=).*
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.