README.md in aliyun_open_search-0.4.0 vs README.md in aliyun_open_search-0.5.0

@@ -63,10 +63,16 @@
                 "fields": {
                   "id": "1211391233136",
                   "styl_name": "baoma",
                   "acquirer_id": "1"
                 }
+              },
+              {
+                "cmd": "delete",
+                "fields": {
+                  "id": "3"
+                }
               }
             ]
           }
 
 response = AliyunOpenSearch::Syncs.new(app_name).execute(params)
@@ -88,10 +94,11 @@
             formula: "second_bbs",
             summary: "summary_snipped:1,summary_field:title,summary_element:high,summary_len:32,summary_ellipsis:...;summary_snipped:2,summary_field:body,summary_element:high,summary_len:60,summary_ellipsis:..."
           }
 # 更多例子
 
+# 1. 
 # params = {
 #   query: [
 #     [
 #       "query=default:'#{value}'",
 #       "cars_company_id:'#{value}'",
@@ -105,10 +112,29 @@
 #     "config=start:#{page},hit:#{params[:per_page]}"
 #   ],
 #   fetch_fields: :id
 # }
 
+# 2. 
+# start = per_page * (current_page - 1)
+# query = [
+#   "default:'#{@value}'",
+#   "configuration:'#{@value}'",
+#   "user_info:'#{@value}'",
+#   "authority_roles:'#{@value}'"
+# ].join(" OR ")
+
+# query = "query=(" + query + ") AND cars_company_id:'#{@company_id}'"
+
+# params = {
+#   query: [
+#     query,
+#     "config=start:#{start},hit:#{@per_page}"
+#   ],
+#   fetch_fields: :id
+# }
+
 AliyunOpenSearch::Search.new("test", "test2", "test3").execute(params)
 
 ```
 
 ### 签名
@@ -134,13 +160,44 @@
       }
     ].to_json
   }
 
   AliyunOpenSearch::Base.signature(
-    AliyunOpenSearch::Base.new.basic_params.merge!(custom_params)
+    AliyunOpenSearch::Base.basic_params.merge!(custom_params)
   )
 
 ```
+
+### 检索
+
+```ruby
+require "aliyun_open_search"
+
+scan_service = AliyunOpenSearch::Scan.new("test")
+scan_service = AliyunOpenSearch::Scan.new(["test", "test2"])
+
+# AliyunOpenSearch::Scan.new(
+#   ["test", "test2"], 
+
+# 配置: 
+#   query: "query=default:'abc'", # 默认所有
+#   hit: "400", # 默认500, 范围 0~500
+#   scroll: "1w", 
+#   # 用来表示scroll请求的有效期，默认时间单位为ms, 也可以用1m表示1min
+#   # 支持的时间单位包括：w=Week, d=Day, h=Hour, m=minute, s=second
+#   format: "xml" # 默认 JSON
+# )
+
+scan_service.execute # 获取第一页
+scan_service.result # 获取结果
+
+# 下一页
+scan_service.execute # 获取第二页
+scan_service.result # 获取结果
+
+
+```
+
 
 ### 测试
 ##### 大部分时候, 我们并不需要真正的发出请求, 需要mock掉
 
 ```ruby