subject(binaryaddition):add readmed

subjects/binaryaddition/README.md

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+## binary-addition
+
+### Instructions
+
+Write a function named `BinaryAddition(int,int)` that takes two integers and returns the sum of the two in binary in an array of `int`.
+- If the sum is negative return `nil` value.
+- convert the argument to binary then add the two binary numbers together
+
+### Expected function 
+```go
+func BinaryAddition(a int, b int) []int {
+    // your code here
+}
+```
+
+### Usage
+
+```go
+package main
+
+import "fmt"
+
+
+func main(){
+    fmt.Println(BinaryAddition(1,1))
+    fmt.Println(BinaryAddition(1,2))
+    fmt.Println(BinaryAddition(1,3))
+    fmt.Println(BinaryAddition(4,4))
+}
+```
+
+and the output should be:
+
+```console
+$ go run . 
+[1 0]
+[0 1 1]
+[1 0 0]
+[0 1 1]
+[1 0 0]
+[1 0 1]
+```