Add missing trade_page_url to exchanges (Part A)

[tmlee]

In reference to

• https://github.com/coingecko/cryptoexchange/blob/master/lib/cryptoexchange/exchanges/binance/market.rb#L7
• https://github.com/coingecko/cryptoexchange/blob/master/spec/exchanges/binance/integration/market_spec.rb#L20
• Label the exchange in the README when implemented

add trade_page_url to list of the following exchanges

• [ ] BX Thailand
• [ ] Bancor
• [ ] Bishang
• [ ] Bisq
• [ ] Tokok
• [ ] Sistemkoin
• [ ] SingularX

If not available, put the root url of the exchange

[hasinifoss]

I'll work on this.

[tmlee]

Thanks! @hasinifoss feel free to reach out for any questions :)

[tmlee]

@hasinifoss are you still working on this? otherwise i will open this up for grabs.