Fix api page

autoload/SpaceVim/api/file.vim

@@ -3,8 +3,10 @@ let s:system = SpaceVim#api#import('system')
 
 if s:system.isWindows
     let s:file['separator'] = '\'
+    let s:file['pathSeparator'] = ';'
 else
     let s:file['separator'] = '/'
+    let s:file['pathSeparator'] = ':'
 endif
 
 function! SpaceVim#api#file#get() abort

docs/api/file.md

@@ -2,10 +2,13 @@
 title: "file api"
 ---
 
+# [APIs](https://spacevim.org/apis) : file
+
 ## values
 
 name   | values | description
 ----- |:----:| ------------------
-separator | `/` or `\\` | the separator based on the os
+separator | `/` or `\` | The system-dependent name-separator character.
+pathSeparator | `:` or `;` |  The system-dependent path-separator character.
 
 ## functions

docs/api/system.md

@@ -2,6 +2,8 @@
 title: "system api"
 ---
 
+# [APIs](https://spacevim.org/apis) : system
+
 ## values
 
 name   | values | description

docs/apis.md

@@ -4,9 +4,25 @@ title: "APIs"
 
 # SpaceVim public APIs:
 
-SpaceVim provide many public apis, you can use this apis in your plugins. here is the list of all the apis:
+SpaceVim provide many public apis, you can use this apis in your plugins. 
 
-nanme | description
------ | ------------------
-file  | 
-system |
+## Usage
+
+```viml
+
+let s:file = SpaceVim#api#import('file')
+let s:system = SpaceVim#api#import('system')
+
+if s:system.isWindows
+    echom "Os is Windows"
+endif
+echom s:file.separator
+echom s:file.pathSeparator
+```
+
+here is the list of all the apis, and welcome to contribute to SpaceVim.
+
+name | description | documentation
+----- |:----:| -------
+file  | basic api about file and directory | [readme](https://spacevim.org/api/file)
+system | basic api about system | [readme](https://spacevim.org/api/system)