Give props to contributors

This is a first stab at making a separate file containing contributors. It is a lot of manual work, but we can update it in bulk, and it's worth it to ensure people get virtual compliments for their hard work, even if that hard work might not be code specific.

This starts work at fixing #1223

CONTRIBUTORS.md

@@ -0,0 +1,68 @@
+# Contributors
+
+Gutenberg is built by many contributors and volunteers. Thanks to all of them for their work!
+
+This list is manually curated to include valuable contributions by volunteers that do not include code, such as user testing, providing feedback, or mockups. Please edit this list to include new contributors as they come in. There is no particular order to this list. If you or someone else were omitted from this list, we assure you that was not intentional. Please let us know and we'll add you.
+
+- @youknowriad
+- @aduth
+- @jasmussen
+- @iseulde
+- @mtias
+- @nylen
+- @EphoxJames
+- @mkaz
+- @notnownikki
+- @BE-Webdesign
+- @njpanderson
+- @mimo84
+- @intronic
+- @westonruter
+- @mcsf
+- @dmsnell
+- @afercia
+- @paulwilde
+- @mitogh
+- @codebykat
+- @ahmadawais
+- @kopepasah
+- @circlecube
+- @adamsilverstein
+- @timmyc
+- @ephox-mogran
+- @nb
+- @JDGrimes
+- @Soean
+- @mapk
+- @sirjonathan
+- @j-falk
+- @ryelle
+- @ntwb
+- @lamosty
+- @willybahuaud
+- @maurobringolf
+- @aaronjorbin
+- @spocke
+- @androb
+- @annaephox
+- @Afraithe
+- @georgeh
+- @m
+- @melchoyce
+- @pento
+- @karmatosed
+- @nitrajka
+- @sirreal
+- @inhil
+- @georgeolaru
+- @martinlugton
+- @joyously
+- @rileybrook
+- @azaozz
+- @folletto
+- @ianstewart
+- @johnpixle
+- @mrwweb
+- @diegoliv
+- @lukecav
+- @shaunandrews

README.md

@@ -10,11 +10,14 @@ This is the development hub for the <a href="https://make.wordpress.org/core/201
 
 WordPress already supports a large amount of "blocks", but doesn't surface them very well, nor does it give them much in the way of layout options. By embracing the blocky nature of rich post content, we will surface the blocks that already exist, as well as provide more advanced layout options for each of them. This will allow you to easily compose beautiful posts like <a href="http://moc.co/sandbox/example-post/">this example</a>.
 
+## Contributors
+
+Gutenberg is built by many contributors and volunteers. Please see the full list in <a href="CONTRIBUTORS.md">CONTRIBUTORS.md</a>.
+
 ## Further Reading
 
 - <a href="https://make.wordpress.org/core/2017/01/17/editor-technical-overview/">Editor Technical Overview</a>
 - <a href="https://make.wordpress.org/core/2017/05/05/editor-how-little-blocks-work/">How Blocks Work</a>
-- <a href="https://wpcoredesign.mystagingwebsite.com/gutenberg/">Editor Mockups</a>
 - <a href="https://github.com/Automattic/wp-post-grammar">WP Post Grammar Parser</a>
 - <a href="https://make.wordpress.org/core/tag/gutenberg/">Development updates on make.wordpress.org</a>