Reads file as String - description of the new function.

docs/en/sql-reference/functions/files.md

@@ -0,0 +1,35 @@
+---
+toc_priority: 68
+toc_title: Files
+---
+
+# Functions for Working with Files {#functions-for-working-with-files}
+
+## file() {#file}
+
+Reads file as a String. The file can contain subqueries, condition, names of columns  and any other information that will be read as one line.
+
+**Syntax**
+
+``` sql
+file(filename)
+```
+
+**Arguments**
+
+-   `filename` — The name of the file to read. The file must be located in the user's directory specified in `user_files_path` settings.
+
+**Example**
+
+Inserting data from files a.txt and b.txt in the table as separate rows.
+
+Query:
+
+``` sql
+INSERT INTO table SELECT file('a.txt'), file('b.txt')
+```
+
+**See Also**
+
+-   [user_files_path][../../operations/server-configuration-parameters/settings.md#server_configuration_parameters-user_files_path](#)
+