add checksum to readme

README.md

-## DNSMASQ fork for improving --ipsets, --server, --address performance
+## DNSMASQ fork for improving --ipsets, --server, and --address performance
 
-### Current status
+Dnsmasq matches domain names for --ipsets, --server, and --address options by
+iterates over linked list. It is good enough for general use, but slows down as
+the domain names to be matched grows.
 
-The --ipsets, --server, and --address lookup has been rewritten. It scales well
-with thousands of --ipsets and --server entries.
+Here introduce a modified dnsmasq for fast lookup ipset/server/address options.
+The match time is constant regardless the size of rules.
 
 
                        root
@@ -30,14 +32,18 @@ bucket. For locating a particular label from hash table, two hash values are
 compared first, only if they are match, should the more expensive string
 comparison be used to confirm the search.
 
-The search should take constant time regardless the size of --ipset and --server
-rules.
 
+### Precompiled OpenWrt packages
 
-### Precompiled binary
+For OpenWrt Attitude Adjustment (12.09 final) and Barrier Breaker (14.07)
+[ar71xx](http://sourceforge.net/projects/dnsmasq-fast-lookup/files/). DNSSEC is
+disabled.
 
-for OpenWrt Attitude Adjustment (12.09 final) and Barrier Breaker (14.07) [ar71xx](http://sourceforge.net/projects/dnsmasq-fast-lookup/files/)
+    sha1sum
+    d9376f269e14eeb2823df1c1d12ec6168914927b  dnsmasq-ipset_2.72-4_ar71xx_Attitude_Adjustment_12.09.ipk
+    5b5e677c7115ce35eaa2624861c8f291153a2a8c  dnsmasq-ipset_2.72-4_ar71xx_Barrier_Breaker_14.07.ipk
 
+    md5sum
+    8717aec763d90061d157d28f5ba6a959  dnsmasq-ipset_2.72-4_ar71xx_Attitude_Adjustment_12.09.ipk
+    dba2b0a803afbd8f4ebe67bf0a1cce6b  dnsmasq-ipset_2.72-4_ar71xx_Barrier_Breaker_14.07.ipk
 
-
-[Contact me](mailto: weichen302@gmail.com)