docs: introduce how to generate a random phone number (#594)

Co-authored-by: rick <linuxsuren@users.noreply.github.com>

README.md

@@ -94,7 +94,7 @@ docker run -p 1234:8080 -v /var/tmp:/var/tmp \
 
 ## Template
 
-The following fields are templated with [sprig](http://masterminds.github.io/sprig/):
+The following fields are templated with [sprig](https://masterminds.github.io/sprig/):
 
 * API
 * Request Body
@@ -102,7 +102,7 @@ The following fields are templated with [sprig](http://masterminds.github.io/spr
 
 ### Functions
 
-You could use all the common functions which comes from [sprig](http://masterminds.github.io/sprig/). Besides some specific functions are available:
+You could use all the common functions which comes from [sprig](https://masterminds.github.io/sprig/). Besides some specific functions are available:
 
 | Name | Usage |
 |---|---|

docs/site/content/zh/latest/tasks/template.md

@@ -0,0 +1,13 @@
++++
+title = "用例模板"
++++
+
+`atest` 采用 [sprig](https://masterminds.github.io/sprig/) 作为测试用例的模板引擎。通过模板函数可以生成很多随机数据：
+
+## 手机号
+
+下面的代码可以生成 `182` 开头的手机号：
+
+```
+182{{shuffle "09876543"}}
+```