docs: add go example (#13783)

docs/examples/.gitignre

-.vscode
-*.lock
\ No newline at end of file

docs/examples/go/insert/sql/main.go

+package main
+
+import (
+	"database/sql"
+	"fmt"
+
+	_ "github.com/taosdata/driver-go/v2/taosRestful"
+)
+
+func createStable(taos *sql.DB) {
+	_, err := taos.Exec("CREATE DATABASE power")
+	if err != nil {
+		fmt.Println("failed to create database, err:", err)
+	}
+	_, err = taos.Exec("CREATE STABLE power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (location BINARY(64), groupId INT)")
+	if err != nil {
+		fmt.Println("failed to create stable, err:", err)
+	}
+}
+
+func insertData(taos *sql.DB) {
+	sql := `INSERT INTO power.d1001 USING power.meters TAGS(California.SanFrancisco, 2) VALUES ('2018-10-03 14:38:05.000', 10.30000, 219, 0.31000) ('2018-10-03 14:38:15.000', 12.60000, 218, 0.33000) ('2018-10-03 14:38:16.800', 12.30000, 221, 0.31000)
+	power.d1002 USING power.meters TAGS(California.SanFrancisco, 3) VALUES ('2018-10-03 14:38:16.650', 10.30000, 218, 0.25000)
+	power.d1003 USING power.meters TAGS(California.LosAngeles, 2) VALUES ('2018-10-03 14:38:05.500', 11.80000, 221, 0.28000) ('2018-10-03 14:38:16.600', 13.40000, 223, 0.29000)
+	power.d1004 USING power.meters TAGS(California.LosAngeles, 3) VALUES ('2018-10-03 14:38:05.000', 10.80000, 223, 0.29000) ('2018-10-03 14:38:06.500', 11.50000, 221, 0.35000)`
+	result, err := taos.Exec(sql)
+	if err != nil {
+		fmt.Println("failed to insert, err:", err)
+		return
+	}
+	rowsAffected, err := result.RowsAffected()
+	if err != nil {
+		fmt.Println("failed to get affected rows, err:", err)
+		return
+	}
+	fmt.Println("RowsAffected", rowsAffected)
+}
+
+func main() {
+	var taosDSN = "root:taosdata@http(localhost:6041)/"
+	taos, err := sql.Open("taosRestful", taosDSN)
+	if err != nil {
+		fmt.Println("failed to connect TDengine, err:", err)
+		return
+	}
+	defer taos.Close()
+	createStable(taos)
+	insertData(taos)
+}