feat: add hello world 10 times example (#671)

Contributed by @guerrevg

- Adds loop example printing Hello World 10 times
- Located in Basics/03_control_flow/
- Includes docstring documentation
- Tested and verified working

Resolves issue #671

Author: hackdartstorm

Basics/03_control_flow/051_hello_10_times.py

@@ -0,0 +1,5 @@
+""" print 'Hello World' 10 times """
+
+for i in range(10):
+    print("Hello World")
+