Update README

README

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+
+Forked form ig0tik3d version, this uses a different algo for echo algorithm
+This version compiles only on CPU supporting the AES-NI instruction set.
+
+If building from git repo:
+	chmod +x autogen.sh
+	./autogen.sh
+	./configure CFLAGS="-O3 -march=native"  # march=native mandatory, for compile on AES-NI processors 
+#or use:
+	./configure CFLAGS="-O3 -msse2 -msse3 -mssse3 -maes -mavx # if you want to compile on a different machine
+	make
+
+
 This is a multi-threaded CPU miner for Litecoin and Bitcoin,
 and now QubitCoin, forked from poolers cpuminer which is a 
 fork of Jeff Garzik's reference cpuminer.