Organizing some of the files

.gitignore

@@ -1,3 +1,4 @@
+demo.asm
 *.nes
 *.nes.yaml
 .DS_Store

README.md

@@ -58,7 +58,7 @@ An NES assembler for the 6502 microprocessor written in Ruby
   There is an example file included (shown below) that is a modified port of
   the NES101 tutorial by Michael Martin.
 
-  ![Scrolling NES Demo](assembler_demo.png)
+  ![Scrolling NES Demo](github_images/assembler_demo.png)
 
   Some Todos:
   - Get an NSF file playing

background.asm

@@ -1,76 +0,0 @@
-  .inesprg 1   ; 1x 16KB PRG code
-  .ineschr 1   ; 1x  8KB CHR data
-  .inesmap 0   ; mapper 0 = NROM, no bank swapping
-  .inesmir 1   ; background mirroring
-  
-
-;;;;;;;;;;;;;;;
-
-    
-  .bank 0
-  .org $C000 
-RESET:
-  SEI          ; disable IRQs
-  CLD          ; disable decimal mode
-  LDX #$40
-  STX $4017    ; disable APU frame IRQ
-  LDX #$FF
-  TXS          ; Set up stack
-  INX          ; now X = 0
-  STX $2000    ; disable NMI
-  STX $2001    ; disable rendering
-  STX $4010    ; disable DMC IRQs
-
-vblankwait1:       ; First wait for vblank to make sure PPU is ready
-  BIT $2002
-  BPL vblankwait1
-
-clrmem:
-  LDA #$00
-  STA $0000, x
-  STA $0100, x
-  STA $0200, x
-  STA $0400, x
-  STA $0500, x
-  STA $0600, x
-  STA $0700, x
-  LDA #$FE
-  STA $0300, x
-  INX
-  BNE clrmem
-   
-vblankwait2:      ; Second wait for vblank, PPU is ready after this
-  BIT $2002
-  BPL vblankwait2
-
-
-  LDA #%10000000   ;intensify blues
-  STA $2001
-
-Forever:
-  JMP Forever     ;jump back to Forever, infinite loop
-  
- 
-
-NMI:
-  RTI
- 
-;;;;;;;;;;;;;;  
-  
-  
-  
-  .bank 1
-  .org $FFFA     ;first of the three vectors starts here
-  .dw NMI        ;when an NMI happens (once per frame if enabled) the 
-                   ;processor will jump to the label NMI:
-  .dw RESET      ;when the processor first turns on or is reset, it will jump
-                   ;to the label RESET:
-  .dw 0          ;external interrupt IRQ is not used in this tutorial
-  
-  
-;;;;;;;;;;;;;;  
-  
-  
-  .bank 2
-  .org $0000
-  .incbin "mario.chr"   ;includes 8KB graphics file from SMB1