Add instructions on how to use radare2

Basic instructions to use radare2 for exploring a GB ROM.
7 years ago · 3a81d81c2a
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+# How to use radare2 to explore a GB ROM
+
+First load the ROM in radare2
+
+> r2 <ROM>
+
+Enter Visual Mode by pressing 'V', cycle through visualization with 'p'.
+Then step over instructions with 's'.