Add readme.md with basic usage

examples/readme.md

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+# About
+
+Attempts to translate x86 assembly into mos6502 assembly.
+
+# Why?
+
+Why not? I figured I just barely knew some x86 and some 6502, so why not learn some more about both. Besides, this project can actually have some interesting applications.
+
+# Example
+
+After compilation (requires a full C++14 compiler), you can run something like this:
+
+```assembly_x86
+// test.asm
+main:
+	movb	$1, 53280
+	xorl	%eax, %eax
+	ret
+```
+
+```bash
+cat test.asm | x86-to-6502
+```
+
+And get this output:
+
+```
+main:
+	ldy #$1
+	sty 53280
+	lda $00
+	rts 
+```
+
+# Caveats
+
+ * Nothing is guaranteed. This could break your computer. Who knows?
+ * All values are truncated to 8 bit. We have no support for 16bit math or pointers yet
+ * Only as many instructions are supported as I have needed to support to get my test cases working
+
+# To Do
+
+*Everything*
+
+Well, lots of things.
+
+ * Better / more efficient translation
+ * Support for 16bit math? Maybe? We need to at least be able to do 16bit pointer math
+ * Consider supporting the "Sweet 16" virtual 16bit CPU that Woz designed?
+ * Maybe for 16bit operation we try to detect if the input code is working on 8bit registers or 16+bit registers and do the right thing?
+ * Support for more CPU instructions
+ * A test suite
+
+