Add Golang test parser

reports/go/calculator.go

@@ -0,0 +1,20 @@
+package main
+
+import "errors"
+
+func CalculatorSum(a, b int) int {
+	return a + b
+}
+
+func CalculatorDivide(a, b int) int {
+	return a / b
+}
+
+var ErrDivideByZero = errors.New("divide by zero")
+
+func CalculatorSafeDivide(a, b int) (int, error) {
+	if b == 0 {
+		return 0, ErrDivideByZero
+	}
+	return a / b, nil
+}