Added script for automatically generating DIRECTORY.md (#889)

* Added script for automatically generating DIRECTORY.md

* Sort and list files by alphabetical order

* Rename script.py to ~script.py

~script.py

@@ -0,0 +1,70 @@
+"""
+This is a simple script that will scan through the current directory
+and generate the corresponding DIRECTORY.md file, can also specify
+files or folders to be ignored.
+"""
+import os
+
+
+# Target URL (master)
+URL = "https://github.com/TheAlgorithms/Python/blob/master/"
+
+
+def tree(d, ignores, ignores_ext):
+    return _markdown(d, ignores, ignores_ext, 0)
+    
+
+def _markdown(parent, ignores, ignores_ext, depth):
+    out = ""
+    dirs, files = [], []
+    for i in os.listdir(parent):
+        full = os.path.join(parent, i)
+        name, ext = os.path.splitext(i)
+        if i in ignores or ext in ignores_ext:
+            continue
+        if os.path.isfile(full):
+            # generate list
+            pre = parent.replace("./", "").replace(" ", "%20")
+            # replace all spaces to safe URL
+            child = i.replace(" ", "%20")
+            files.append((pre, child, name))
+        else:
+            dirs.append(i)
+    # Sort files
+    files.sort(key=lambda e: e[2].lower())
+    for f in files:
+        pre, child, name = f
+        out += "  " * depth + "* [" + name.replace("_", " ") + "](" + URL + pre + "/" + child + ")\n"
+    # Sort directories
+    dirs.sort()
+    for i in dirs:
+        full = os.path.join(parent, i)
+        i = i.replace("_", " ").title()
+        if depth == 0:
+            out += "## " + i + "\n"
+        else:
+            out += "  " * depth + "* " + i + "\n"
+        out += _markdown(full, ignores, ignores_ext, depth+1)
+    return out
+
+
+# Specific files or folders with the given names will be ignored
+ignores = [".vs",
+    ".gitignore",
+    ".git",
+    "script.py",
+    "__init__.py",
+]
+# Files with given entensions will be ignored
+ignores_ext = [
+    ".md",
+    ".ipynb",
+    ".png",
+    ".jpg",
+    ".yml"
+]
+
+
+if __name__ == "__main__":
+    with open("DIRECTORY.md", "w+") as f:
+        f.write(tree(".", ignores, ignores_ext))