Added '~script.py' to ignore files and updated DIRECTORY.md (#926)

* Added print function into matrix_multiplication_addition.py and removed blank space in data_structures/binary tree directory

* Removed .vs/ folder per #893

* Rename matrix_multiplication_addition.py to matrix_operation.py

* Added '~script.py' to ignore files and updated DIRECTORY.md

~script.py

@@ -52,7 +52,7 @@ def _markdown(parent, ignores, ignores_ext, depth):
 ignores = [".vs",
     ".gitignore",
     ".git",
-    "script.py",
+    "~script.py",
     "__init__.py",
 ]
 # Files with given entensions will be ignored