http.client: Add basic example.

http.client/test_client.py

@@ -2,7 +2,7 @@ from http.client import HTTPConnection
 
 
 conn = HTTPConnection("localhost")
-#conn = HTTPConnection("micropython.org")
+#conn = HTTPConnection("python.org")
 conn.request("GET", "/")
 resp = conn.getresponse()
 print(resp)