quickstarts: add examples for adb

Author: shanye997

quickstarts/AnalyticDB_for_MySQL(ADB)/101-adb-resource-group-docs-Example/README.md

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+## Introduction
+
+This example is used to create a `alicloud_adb_resource_group` resource.
+
+<!-- BEGIN_TF_DOCS -->
+## Providers
+
+| Name | Version |
+|------|---------|
+| <a name="provider_alicloud"></a> [alicloud](#provider\_alicloud) | n/a |
+
+## Modules
+
+No modules.
+
+## Resources
+
+| Name | Type |
+|------|------|
+| [alicloud_adb_db_cluster.default](https://registry.terraform.io/providers/aliyun/alicloud/latest/docs/resources/adb_db_cluster) | resource |
+| [alicloud_adb_resource_group.default](https://registry.terraform.io/providers/aliyun/alicloud/latest/docs/resources/adb_resource_group) | resource |
+| [alicloud_vpc.default](https://registry.terraform.io/providers/aliyun/alicloud/latest/docs/resources/vpc) | resource |
+| [alicloud_vswitch.default](https://registry.terraform.io/providers/aliyun/alicloud/latest/docs/resources/vswitch) | resource |
+| [alicloud_adb_zones.default](https://registry.terraform.io/providers/aliyun/alicloud/latest/docs/data-sources/adb_zones) | data source |
+| [alicloud_resource_manager_resource_groups.default](https://registry.terraform.io/providers/aliyun/alicloud/latest/docs/data-sources/resource_manager_resource_groups) | data source |
+
+## Inputs
+
+| Name | Description | Type | Default | Required |
+|------|-------------|------|---------|:--------:|
+| <a name="input_name"></a> [name](#input\_name) | n/a | `string` | `"tf_example"` | no |
+<!-- END_TF_DOCS -->

quickstarts/AnalyticDB_for_MySQL(ADB)/101-adb-resource-group-docs-Example/main.tf

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+variable "name" {
+  default = "tf_example"
+}
+
+data "alicloud_adb_zones" "default" {
+}
+data "alicloud_resource_manager_resource_groups" "default" {
+  status = "OK"
+}
+
+resource "alicloud_vpc" "default" {
+  vpc_name   = var.name
+  cidr_block = "10.4.0.0/16"
+}
+resource "alicloud_vswitch" "default" {
+  vpc_id       = alicloud_vpc.default.id
+  cidr_block   = "10.4.0.0/24"
+  zone_id      = data.alicloud_adb_zones.default.zones[0].id
+  vswitch_name = var.name
+}
+
+resource "alicloud_adb_db_cluster" "default" {
+  compute_resource    = "48Core192GB"
+  db_cluster_category = "MixedStorage"
+  db_cluster_version  = "3.0"
+  db_node_class       = "E32"
+  db_node_storage     = 100
+  description         = var.name
+  elastic_io_resource = 1
+  maintain_time       = "04:00Z-05:00Z"
+  mode                = "flexible"
+  payment_type        = "PayAsYouGo"
+  resource_group_id   = data.alicloud_resource_manager_resource_groups.default.ids.0
+  security_ips        = ["10.168.1.12", "10.168.1.11"]
+  vpc_id              = alicloud_vpc.default.id
+  vswitch_id          = alicloud_vswitch.default.id
+  zone_id             = data.alicloud_adb_zones.default.zones[0].id
+  tags = {
+    Created = "TF",
+    For     = "example",
+  }
+}
+
+resource "alicloud_adb_resource_group" "default" {
+  group_name    = "TF_EXAMPLE"
+  group_type    = "batch"
+  node_num      = 0
+  db_cluster_id = alicloud_adb_db_cluster.default.id
+}

quickstarts/AnalyticDB_for_MySQL(ADB)/101-adb-resource-group-docs-Example/provider.tf

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+terraform {
+  required_providers {
+    alicloud = {
+      source = "aliyun/alicloud"
+    }
+  }
+}