Create issue templates

Author: jeffgerickson

.github/ISSUE_TEMPLATE/error-report.md

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+---
+name: Error report
+about: Report a specific error in the book, lecture notes, or web site
+title: "[Oops.]"
+labels: ''
+assignees: ''
+
+---
+
+* Please verify that the error is present in the most recent revision before reporting
+* For errors in the book, please indicate the chapter and page number
+* For errors in the notes, please indicate the note title and page number
+* In both cases, please describe the bug in detail, and if possible, suggest a correction.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for future revisions of the book
+title: Please...
+labels: ''
+assignees: ''
+
+---
+
+I welcome your suggestions for future revisions of the textbook.  These could include suggestions for additional material (some of which may already be covered in my related lecture notes) or new examples or intuition or exercises that you find helpful.  Alternatively, these could include requests for additional detail in material that you find tricky, or _reduced_ detail in material you find excessive.  
+
+Please be as specific in your request as possible.

.github/ISSUE_TEMPLATE/other-feedback.md

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+---
+name: Other feedback
+about: Provide other feedback on these materials
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+I also welcome any other feedback on the book, lecture notes, and other course materials.