os_lib: add simple os usage example

Author: agridyaev

os_lib/01_print_info.py

@@ -0,0 +1,11 @@
+import os
+import sys
+
+print(os.name)
+print(os.environ)
+print(os.getcwd())
+
+if len(sys.argv) == 1:
+    print(os.listdir(os.getcwd()))
+else:
+    print(os.listdir(sys.argv[1]))