Add README.md

challenge_2/rust/makernaren/README.md

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+## Single Number
+#### To run the code : 
+* Open this directory in terminal and run `go run max_occurance.go` to compile and run the code.
+* To test the code just run, `go test` in same directory.
+```
+$ go run max_occurance.go 
+gGiven array is : [2 a l 3 l 4 k 2 3 4 a 6 c 4 m 6 m k 9 10 9 8 7 8 10 7] 
+Element that occur only max number of times : 4
+
+$ go test                
+PASS
+ok      path/to/2017Challenges/challenge_2/rust/makernaren 0.005s
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured
+```