add doc

README.md

@@ -249,7 +249,7 @@ These examples incubate dotSCAD and dotSCAD refactors these examples. See [examp
 
 - [mz_square_cells](https://openhome.cc/eGossip/OpenSCAD/lib2x-mz_square_cells.html)
 - [mz_square_get](https://openhome.cc/eGossip/OpenSCAD/lib2x-mz_square_get.html)
-- mz_square_walls
+- [mz_square_walls](https://openhome.cc/eGossip/OpenSCAD/lib2x-mz_square_walls.html)
 - mz_hex_walls
 - mz_square_initialize
 - mz_hamiltonian

docs/lib2x-mz_square_walls.md

@@ -0,0 +1,34 @@
+# mz_square_walls
+
+It's a helper for creating wall data from maze cells. You can transform wall points for creating different types of mazes.
+
+**Since:** 2.5
+
+## Parameters
+
+- `cells` : Maze cells.
+- `rows` : The rows of the maze.
+- `columns` : The columns of the maze.
+- `cell_width` : The width of a cell.
+- `left_border` : Default to `true`. Create the leftmost border of the maze.
+- `bottom_border` : Default to `true`. Create the bottommost border of the maze.
+
+## Examples
+    
+	use <maze/mz_square_cells.scad>;
+	use <maze/mz_square_walls.scad>;
+	use <polyline2d.scad>;
+
+	rows = 10;
+	columns = 10;
+	cell_width = 5;
+	wall_thickness = 2;
+
+	cells = mz_square_cells(rows, columns);
+	walls = mz_square_walls(cells, rows, columns, cell_width);
+
+	for(wall = walls) {
+		polyline2d(wall, wall_thickness, joinStyle = "JOIN_MITER");
+	}
+	
+![mz_square_walls](images/lib2x-mz_square_walls-1.JPG)

src/maze/mz_square_walls.scad

@@ -1,3 +1,13 @@
+/**
+* mz_square_walls.scad
+*
+* @copyright Justin Lin, 2020
+* @license https://opensource.org/licenses/lgpl-3.0.html
+*
+* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-mz_square_walls.html
+*
+**/
+
 use <../util/dedup.scad>;
 use <_impl/_mz_square_walls_impl.scad>;