:sparkles: (Go) working with integers and creating example documentation for fn

Go/integers/adder.go

···
+package integers
+
+func Add(x, y int) int {
+    return x + y
+}

Go/integers/adder_test.go

···
+package integers
+
+import (
+    "testing"
+    "fmt"
+)
+
+func TestAdd(t *testing.T) {
+    sum := Add(2, 2)
+    expected := 4
+
+    if sum != expected {
+        t.Errorf("expected '%d' but got '%d'", expected, sum)
+    }
+}
+
+func ExampleAdd() {
+    sum := Add(1, 5)
+    fmt.Println(sum)
+    // Output: 6
+}