some docs

Author: dradetsky

doc/configuration.md

@@ -124,6 +124,22 @@ To sort files by <a href="https://en.wikipedia.org/wiki/MAC_times#Access_time_(a
 (setq projectile-sort-order 'access-time)
 ```
 
+To sort files by the length of the file path:
+
+```el
+(setq projectile-sort-order path-length)
+```
+
+To sort files by a user-defined method:
+
+```el
+;; passed to PREDICATE of cl-sort
+(defun my-custom-sort-method (file1 file2)
+  (< (length file1) (length file2)))
+
+(setq projectile-sort-custom-method 'my-custom-sort-method)
+(setq projectile-sort-order custom-method)
+```
 
 ## Caching