Add basic ls -1 functionality

Author: Zobeir-Rigi

implement-shell-tools/ls/ls.py

@@ -0,0 +1,16 @@
+import sys
+import os
+
+args = sys.argv[1:]
+
+# default folder = current folder
+path = "."
+
+# if user gives a folder
+if len(args) > 1:
+    path = args[1]
+
+files = os.listdir(path)
+
+for file in files:
+    print(file)