update doc

README.md

@@ -17,6 +17,8 @@ Please refer to the image below. PHPExcel has been unable to work properly for m
 
 xlswriter is a PHP C Extension that can be used to write text, numbers, formulas and hyperlinks to multiple worksheets in an Excel 2007+ XLSX file. It supports features such as:
 
+###### Writer
+
 * 100% compatible Excel XLSX files.
 * Full Excel formatting.
 * Merged cells.
@@ -31,6 +33,12 @@ xlswriter is a PHP C Extension that can be used to write text, numbers, formulas
 * FreeBSD License.
 * The only dependency is on zlib.
 
+###### Reader
+
+* Full read data
+* Cursor read data
+* Read by data type
+
 #### Benchmark
 
 Test environment: Macbook Pro 13 inch, Intel Core i5, 16GB 2133MHz LPDDR3 Memory, 128GB SSD Storage.

README_zh.md

@@ -19,6 +19,8 @@ xlswriter是一个 PHP C 扩展，可用于在 Excel 2007+ XLSX 文件中读取
 
 它具备以下特性：
 
+###### 一、写入
+
 * 100％兼容的Excel XLSX文件
 * 完整的Excel格式
 * 合并单元格
@@ -33,6 +35,12 @@ xlswriter是一个 PHP C 扩展，可用于在 Excel 2007+ XLSX 文件中读取
 * FreeBSD许可证
 * 唯一的依赖是zlib
 
+###### 二、读取
+
+* 完整读取数据
+* 光标读取数据
+* 按数据类型读取
+
 #### 基准测试
 
 测试环境: Macbook Pro 13 inch, Intel Core i5, 16GB 2133MHz LPDDR3 Memory, 128GB SSD Storage.