add readme and disc files

Author: aap

disc/SYSTEM.CNF

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+BOOT2 = cdrom0:\RWTEST.ELF;1
+VER = 1.00
+VMODE = PAL

disc/disc.iml

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+[SYS]
+VERSION=1.00
+MEDIA=DVD
+TARGET=PS2
+DISCVERSION=1.00
+DATE=2021/08/11-15:19:25
+[/SYS]
+
+[CUE]
+DISCNAME="TEST-12345                      "
+PRODUCER="AAP                             "
+COPYRIGHT="                                "
+CREATIONDATE=20210811
+PSTYPE=2
+DISCCODE=03
+[/CUE]
+
+[LOC]
+# the number of entries: 9
+#Start   End      Mode Fno Source
+0        278      0.0  0   "disc.ims"
+600000   600000   0.0  0   "SYSTEM.CNF"
+600001   600787   0.0  0   "rwtest_sky2.elf"
+600788   600922   0.0  0   "SYSTEM\IOPRP300.IMG"
+600923   600925   0.0  0   "SYSTEM\SIO2MAN.IRX"
+600926   600948   0.0  0   "SYSTEM\PADMAN.IRX"
+600949   601009   0.0  0   "MODELS\GTA3.DIR"
+601010   660601   0.0  0   "MODELS\GTA3.IMG"
+[/LOC]

disc/disc.ims

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+To build, install Sony SDK and RW 3.1 SDK. check options.mk for RW paths
+Make sure you check the defines at the top of main.cpp.
+
+To make a disc, check disc.iml and add the necessary files to the disc directory,
+then use iml2iso to make an iso.
+Take gta3.dir/img from ps2 gta3, and the IOP modules from the Sony SDK.

disc/readme.txt

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+To build, install Sony SDK and RW 3.1 SDK. check options.mk for RW paths
+Make sure you check the defines at the top of main.cpp.
+
+To make a disc, check disc.iml and add the necessary files to the disc directory,
+then use iml2iso to make an iso.
+Take gta3.dir/img from ps2 gta3, and the IOP modules from the Sony SDK.