Adds issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/new-function.md

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+---
+name: New Function
+about: Suggest a new function for one of the modules
+title: Add ModuleName.Extra.functionName
+labels: new function
+assignees: ''
+
+---
+
+## `functionName : type -> signature`
+
+<!-- Add suggested documentation here, including some examples with doctests. -->
+
+
+### Motivating use case 
+
+<!-- Why are you proposing this function? In what specific situation did it come in handy? -->
+
+### Rationale
+
+<!-- If this function didn't exist in this library, what would users need to do? Generally speaking if the function you are proposing is an existing function with some minor change (like arguments flipped or a single literal argument pre-applied), you should make a strong argument about the increase in readability or convenience this is going to bring. If it's a more involved function, make an argument about  how it can be widely applicable and not just specific to one use case. -->