(Markdown) show escape characters

1. Show backticks in Markdown

​//此处写4个反引号
```` 
``` 
if __name__=='__main__':
  print('hello')  
```
```` 
//4个反引号关闭

​

display effect:

if __name__=='__main__':
  print('hello')  

2. Show escape characters in Markdown

In Markdown, you can use a backslash ( \ ) to escape

code:

\#
\*

display effect:

#
*

Markdown supports these symbols preceded by a backslash to help insert common symbols:

\   反斜线
`   反引号
*   星号
_   底线
{}  花括号
[]  方括号
()  括弧
#   井字号
+   加号
-   减号
.   英文句点
!   惊叹号