Update README.md

README.md

@@ -1,3 +1,55 @@
+# Arith Module
+
+## About the module
+
+  Arith module contains 6 arithmetic methods that can be applied on simple keys and 1 arithmetic method 
+  which can be applied on lists.
+
+## Arith methods
+
+### ARITH.SUM
+
+ARITH.SUM key1 key2 key3
+
+Add the values of key1 and key2 and stores the result in key3 and displays the result.
+
+### ARITH.SUB
+
+ARITH.SUB key1 key2 key3
+
+Subtracts the value of key2 from key1 and stores the result in key3 and displays the result.
+
+### ARITH.PROD
+
+ARITH.PROD key1 key2 key3
+
+Multiply the values of key1 and key2 and stores the result in key3 and displays the result.
+
+### ARITH.DIV
+
+ARITH.DIV key1 key2 key3
+
+Divides the value of key1 by key2 and stores the quotient in key3 and displays the quotient.
+The value of key3 should be non-zero.
+
+### ARITH.MOD
+
+ARITH.MOD key1 key2 key3
+
+Divides the value of key1 by key2 and stores the remainder in key3 and displays the remainder.
+
+### ARITH.POW
+
+ARITH.POW key1 key2 key3
+
+Raises the value of key1 to the power of key2 and stores the result in key3 and displays the result.
+
+### ARITH.LINCRBY
+
+ARITH.LINCRBY listkey increment_value start_index end_index
+
+Increases the values present in the range from start_index to end_index (start_index and end_index inclusive) by increment_value
+
 # Quick Start Guide
 
 Here's what you need to do build arith_module:
@@ -44,4 +96,15 @@ OK
 (integer) 16
 127.0.0.1:9979> GET key3
 "16"
+127.0.0.1:6379> RPUSH listkey 1 2 3 4 5
+(integer) 5
+127.0.0.1:6379> ARITH.LINCRBY listkey 100 1 3
+(integer) 3
+127.0.0.1:6379> LRANGE listkey 0 -1
+1) "1"
+2) "102"
+3) "103"
+4) "104"
+5) "5"
+
 ```