Added sample program, fixed maven packaging of resources, updated README

samples/README

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+A Sample Program
+----------------
+
+When loaded at address $0300, this program will print "Hello, 6502 World!" in
+infinite loop.
+
+Assembled with the Ophis assembler:
+
+   https://hkn.eecs.berkeley.edu/~mcmartin/ophis/

samples/hello.asm

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+;;
+;; Output the string 'Hello, World!'
+;;
+
+
+.alias cr  $0d
+.alias lf  $0a
+
+.alias out $c000
+
+.org $0300
+
+start:  ldx #$00
+loop:   lda string,x
+        beq start      ; If A is 0, loop back and start again
+        sta out        ; Otherwise, store into output
+        inx            ; Increment X
+        jmp loop       ; Repeat.
+
+string: .byte "Hello, 6502 world! ", 0