add Flight Simulator II prelaunch

src/prelaunch/fs2.a

@@ -0,0 +1,38 @@
+;license:MIT
+;(c) 2019 by Frank M.
+
+!cpu 6502
+!to "build/PRELAUNCH/FS2",plain
+*=$106
+
+    !source "src/prelaunch/common.a"
+
+         ;+ENABLE_ACCEL   ; can't
+
+         lda   #$2C
+         sta   $1C0
+         lda   #$82
+         sta   $1C1
+         lda   #$C0
+         sta   $1C2
+         lda   #$4C       ; add reboot hook @ $1C0
+         sta   $1C3
+         lda   #$A6
+         sta   $1C4
+         lda   #$FA
+         sta   $1C5
+
+         lda   #$C0
+         sta   $82A8      ; cloned to $3F2
+         sta   $7D43      ; cloned to $FFFC
+         lda   #$01
+         sta   $82A9      ; cloned to $3F3
+         sta   $7D46      ; cloned to $FFFD
+         lda   #$A4
+         sta   $82A0      ; cloned to $3F4
+
+         jmp   $2499
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}