Prepare first release

README.rst

docs/account.rst

docs/amount.rst

docs/asset.rst

docs/block.rst

docs/blockchain.rst

docs/configuration.rst

docs/contribute.rst

docs/index.rst

docs/instances.rst

docs/market.rst

docs/memo.rst

docs/mpa.rst

docs/notify.rst

docs/price.rst

docs/steem.rst

docs/transactionbuilder.rst

docs/transactions.rst

docs/tutorials.rst

docs/websocket.rst