added examples/py/balance-gdax.py
added examples/py/balance-gdax.py

tritoanst/ccxt,ccxt/ccxt,ccxt/ccxt,aiueogawa/ccxt,tritoanst/ccxt,ccxt/ccxt,ccxt/ccxt,aiueogawa/ccxt,ccxt/ccxt,tritoanst/ccxt,aiueogawa/ccxt,tritoanst/ccxt,aiueogawa/ccxt