add examples dir

Author: ccyanxyz

candid.example.py renamed to examples/candid.py

@@ -294,4 +294,4 @@ def test(params, rawTypes =  None):
 # There is no specific return type
 test(params=params)
 # Sepecific return types
-test(params=params, rawTypes=types)
+test(params=params, rawTypes=types)