Add skeleton Editors' Report.

Author: zygoloid

papers/nxxxx.md

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+# Nxxxx Editors' Report -- Programming Languages -- C++
+
+2019-11-xx  
+Richard Smith (editor) (Google Inc)  
+Thomas Köppe (co-editor) (Google DeepMind)  
+Jens Maurer (co-editor)  
+Dawn Perchik (co-editor) (Bright Side Computing, LLC)  
+`<[email protected]>`
+
+## Acknowledgements
+
+...
+
+Thanks to all those who have [submitted editorial
+issues](https://github.com/cplusplus/draft/wiki/How-to-submit-an-editorial-issue)
+and to those who have provided pull requests with fixes.
+
+## New papers
+
+ * [Nxxxx](http://wg21.link/nxxxx) is the committee draft for C++20. It replaces [N4835](http://wg21.link/n4835).
+ * Nxxxx is this Editors' Report.
+
+## Motions incorporated into working draft
+
+### Core working group motions
+
+CWG motion 1: [Core issue resolutions](http://wg21.link/pxxxxr0) for N issues in "tentatively ready" status applied: **(DR)**
+
+ * [123](http://wg21.link/cwg123) Issue description
+ * ...
+
+CWG motion 2: [P1234R5 "Paper name"](http://wg21.link/p1234r5), resolving 3 NB comments:
+
+ * NB 123: Terse description of issue
+
+### Library working group motions
+
+...
+
+## Notable changes to papers as moved
+
+### CWG motion 1
+
+...
+
+## Disposition of editorial NB comments on C++ 2020 CD1
+
+Listed below are draft disposition for all comments that were
+filed as editorial in the ISO 14882 CD (2019) NB comments,
+[Nxxxx](http://wg21.link/nxxxx).
+Except where otherwise noted, these dispositions only represent the current
+viewpoint of the Project Editor.
+
+NB 1: Accepted, fixed in abc123
+
+ * Notes
+
+NB 2: No consensus for change.
+
+ * Notes
+
+NB 3: Accepted with modifications, fixed by 123abc
+
+ * **Modified resolution:** Something.
+
+NB 4: **XWG to handle issue**
+
+## Notable editorial changes
+
+...
+
+### Section label changes
+
+...
+
+## Feature test macros
+
+...
+
+## Minor editorial fixes
+
+A log of editorial fixes made to the working draft since N4835 is below.
+This list excludes changes
+that do not affect the body text or only affect whitespace or typeface. For a
+complete list including such changes (or for the actual deltas applied by these
+changes), consult the [draft sources on github](https://github.com/cplusplus/draft/compare/n4835...nxxxx).
+