Add AUTHORS file listing past and current contributors

Fixes OpenDungeons#379

Author: akien-mga

AUTHORS

@@ -0,0 +1,33 @@
+OpenDungeons has been developed as a community effort since 2009.
+This file aims at listing the contributors that were involved in shaping
+this game over the years. See the CREDITS for a more detailed listing of
+authors and licenses for the assets used in OpenDungeons.
+
+Please contact the current development team in priority using:
+- The forum: http://forum.freegamedev.net/viewforum.php?f=15
+- The GitHub repository: https://github.com/OpenDungeons/OpenDungeons
+
+
+Current contributors, alphabetically:
+  Bertram
+  Danimal
+  Dm3d
+  Elvano
+  eugeneloza
+  hwoarangmy
+  oln
+  paul424
+  Rémi Verschelde (Akien)
+
+
+Legacy contributors, alphabetically:
+  alienwolf
+  Andrew Buck (andrewbuck)
+  blablubod
+  bodsda
+  faichele
+  MCMic
+  Skorpio
+  StefanP.MUC
+  Svenskmand
+  TheAncientGoat

CMakeLists.txt

@@ -615,7 +615,7 @@ if(UNIX)
             DESTINATION ${OD_SHARE_PATH}/applications)
     install(FILES ${CMAKE_BINARY_DIR}/opendungeons.6
             DESTINATION ${OD_SHARE_PATH}/man/man6)
-    install(FILES ${CMAKE_SOURCE_DIR}/{CREDITS,FAQ.txt}
+    install(FILES ${CMAKE_SOURCE_DIR}/{AUTHORS,CREDITS,FAQ.txt}
             DESTINATION ${OD_SHARE_PATH}/doc/${PROJECT_NAME})
     install(DIRECTORY ${CMAKE_SOURCE_DIR}/dist/hicolor
             DESTINATION ${OD_SHARE_PATH}/icons)