new documentation and some fixes in code

docs/lua/File.lua

@@ -0,0 +1,40 @@
+-- luacheck: ignore 111
+
+--[[--
+Class providing filesystem functionality.
+]]
+-- @code File
+
+--- Read contents from path
+-- @treturn string file contents
+-- @realm shared 
+function Read(path) end
+
+--- Write text to file
+-- @realm shared 
+function Write(path, text) end
+
+--- Check if file exists.
+-- @treturn bool
+-- @realm shared 
+function Exists(path) end
+
+--- Check if directory exists.
+-- @treturn bool
+-- @realm shared 
+function DirectoryExists(path) end
+
+--- Check if directory exists.
+-- @treturn table table containing all files
+-- @realm shared 
+function GetFiles(path) end
+
+--- List all directories.
+-- @treturn table table containing all directories
+-- @realm shared 
+function GetDirectories(path) end
+
+--- Search directory for all files including sub directories.
+-- @treturn table table containing all files
+-- @realm shared 
+function DirSearch(path) end