add issue templates

.github/ISSUE_TEMPLATE/blank.md

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+---
+name: Blank issue
+about: Create an issue without a template.
+title: ''
+labels: ''
+assignees: ''
+---

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+---
+
+--- PLEASE READ AND DELETE THE TEXT BELOW BEFORE OPENING THE ISSUE ---
+
+Please ...
+
+- ... describe your problem in detail.
+- ... describe what you expected instead of your problem.
+- ... provide a link to the part of the BIDS specification that is relevant.
+
+--- PLEASE READ AND DELETE THE TEXT ABOVE BEFORE OPENING THE ISSUE ---

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: BIDS NeuroStars forum
+    url: https://neurostars.org/
+    about: Ask (and answer) concrete technical questions or about implementation details around BIDS.
+  - name: BIDS mailing list
+    url: https://groups.google.com/forum/#!forum/bids-discussion
+    about: Use the BIDS mailing list for announcements, and to draw attention to any item related to BIDS

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,21 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+---
+
+--- PLEASE READ AND DELETE THE TEXT BELOW BEFORE OPENING THE ISSUE ---
+
+- Have you checked our contributing guide? It's a helpful resource: https://github.com/bids-standard/bids-specification/blob/master/CONTRIBUTING.md
+
+- Is your idea backwards compatible? If not, please add it to this Google Doc instead of opening an issue: https://docs.google.com/document/d/1LEgsMiisGDe1Gv-hBp1EcLmoz7AlKj6VYULUgDD3Zdw/
+
+- Is there already a group working on your idea? Check the BIDS extension proposals: https://bids.neuroimaging.io/get_involved.html#extending-the-bids-specification
+
+- Will your idea potentially require a large effort? Read BEP lead guidelines: https://docs.google.com/document/d/1pWmEEY-1-WuwBPNy5tDAxVJYQ9Een4hZJM06tQZg8X4/
+
+- When you suggest your idea, please try to supply (mock) examples! 
+
+--- PLEASE READ AND DELETE THE TEXT ABOVE BEFORE OPENING THE ISSUE ---