Add Amstrad ROMs to repository.

ROMImages/AmstradCPC/readme.txt

@@ -1,6 +1,4 @@
-ROM files would ordinarily go here; the copyright status of these is uncertain so they have not been included in this repository. Per http://www.worldofspectrum.org/permits/amstrad-roms.txt, Amstrad themselves allow redistribution but the status of Locomotive's input is unclear.
-
-Expected files:
+Included files:
 
 amsdos.rom
 basic464.rom
@@ -8,4 +6,8 @@ basic664.rom
 basic6128.rom
 os464.rom
 os664.rom
-os6128.rom
+os6128.rom
+
+Amstrad has kindly given its permission for its copyrighted material to be redistributed but Amstrad retains its copyright.
+
+Cf. https://web.archive.org/web/20080510131526/http://web.ukonline.co.uk/cliff.lawson/cpchomec.htm

ROMImages/ZXSpectrum/readme.txt

@@ -11,4 +11,4 @@ With that in mind, Amstrad have kindly given their permission for the redistribu
 plus3.rom	— the +2a/+3 ROM file, 64kb in size.
 plus2.rom	– the +2 ROM file, 32kb in size.
 128.rom		– the 128kb ROM file, 32kb in size.
-48.rom		– the 16/48kb ROM file, 16kb in size.
+48.rom		– the 16/48kb ROM file, 16kb in size.