Update design.txt

cme433_lrtestbench-main/src/design.txt

@@ -2,6 +2,10 @@ Design for the booth multiplier a and b
   1. add 0 to the end of b
   2. divide b into 3 groups
   3. calculate the partial products according to the groups
+    a. Append 0 if sign of 2
+		b. Copy the multiplicand if sign of 1
+		c. If (-) sign take 2s complement
+    d. If (+) don't take 2s complement.
   4. exchange the least 5 column with 1
   5. add all the partial product together