added doc/exchanges.rst doc/exchanges-by-country.rst
added doc/exchanges.rst doc/exchanges-by-country.rst

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