Update contributors with provisional list

contributors.adoc

@@ -3,5 +3,28 @@
 This RISC-V specification has been contributed to directly or indirectly by:
 
 [%hardbreaks]
-* Author1 <required1@email.com>
-* Author2 <required2@email.com>
+* Hesham Almatary <hesham[email protected]>
+* Andres Amaya Garcia <andres[email protected]>
+* David Chisnall <david[email protected]>
+* Jessica Clarke <jessica[email protected]>
+* Brooks Davis <brooks[email protected]>
+* Nathaniel Wesley Filardo <nwf20@cam.ac.uk>
+* Franz A. Fuchs <faf28@cam.ac.uk>
+* Timothy Hutt <timothy[email protected]>
+* Alexandre Joannou <alexandre[email protected]>
+* Tariq Kurd <tariq[email protected]>
+* Ben Laurie <benl@google.com>
+* A. Theodore Markettos <theo[email protected]>
+* David McKay <david[email protected]>
+* Jamie Melling <jamie[email protected]>
+* Stuart Menefy <stuart[email protected]>
+* Simon W. Moore <simon[email protected]>
+* Peter G. Neumann <neumann@csl.sri.com>
+* Robert Norton <robert[email protected]>
+* Alexander Richardson <alexrichardson@google.com>
+* Michael Roe <mr101@cam.ac.uk>
+* Peter Rugg <peter[email protected]>
+* Peter Sewell <peter[email protected]>
+* Carl Shaw <carl[email protected]>
+* Robert N. M. Watson <robert[email protected]>
+* Jonathan Woodruff <jonathan[email protected]>