add 8位加法器

adder/adder.map.summary

@@ -0,0 +1,14 @@
+Analysis & Synthesis Status : Successful - Mon Mar 07 08:49:22 2022
+Quartus II Version : 9.0 Build 235 06/17/2009 SP 2 SJ Web Edition
+Revision Name : adder
+Top-level Entity Name : adder
+Family : Cyclone II
+Total logic elements : 21
+    Total combinational functions : 21
+    Dedicated logic registers : 0
+Total registers : 0
+Total pins : 26
+Total virtual pins : 0
+Total memory bits : 0
+Embedded Multiplier 9-bit elements : 0
+Total PLLs : 0