Added the first go code

errors.go

@@ -0,0 +1,19 @@
+package jira
+
+import (
+	"fmt"
+	"net/http"
+)
+
+// ErrorResponse reports one or more errors caused by an API request.
+type ErrorResponse struct {
+	Response      *http.Response    // HTTP response that caused this error
+	ErrorMessages []string          `json:"errorMessages,omitempty"`
+	Errors        map[string]string `json:"errors,omitempty"`
+}
+
+func (r *ErrorResponse) Error() string {
+	return fmt.Sprintf("%v %v: %d %v %+v",
+		r.Response.Request.Method, r.Response.Request.URL,
+		r.Response.StatusCode, r.ErrorMessages, r.Errors)
+}