add: code example, readme stuff

examples/xored_hello.pasm

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+; Demonstration of printing a xored string, the same base can be used for decrypting shellcode,
+; then, an api can be created that will execute the shellcode ig
+
+; decryption key is at the end of the string because 42 ^ 42 = 0 and we need this null byte
+; a decent way to not do this is to write only the size of the string if we know it beforehand
+set hello 66, 79, 70, 70, 69, 6, 10, 93, 69, 88, 70, 78, 10, 11, 42
+
+main:
+mov a1, hello
+
+loop:
+mov a2, *a1
+xor a2, 42		; decryption key
+mov a2, eax
+push a2
+push 1
+call put
+
+cmp a2, 0
+jne 1
+end
+
+add a1, 8
+jmp loop