Add Python demo

Author: thejohnfreeman

python/README.md

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+# Python Demo
+
+![screenshot of demo in terminal](./python-demo.png)
+
+Demonstrates [xpring-py](https://github.com/thejohnfreeman/xpring-py).
+
+```
+$ poetry install
+$ poetry run python main.py
+```

python/main.py

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+import time
+
+import xpring
+
+
+url = '3.14.64.116:50051'
+seed = 'ss9unxUg8VgvDjWrogKGVDiRRz97n'
+recipient = 'rNJDvXkaBRwJYdeEcx9pchE2SecMkH3FLz'
+amount = '10'
+
+print(f'Using rippled node located at: {url}')
+client = xpring.Client.from_url(url)
+
+wallet = xpring.Wallet.from_seed(seed)
+address = wallet.address
+
+print(f'Retrieving balance for {address}')
+balance = client.get_balance(address)
+print(f'Balance was {balance} drops!')
+
+print('Sending:')
+print(f'- Drops: {amount}')
+print(f'- To: {recipient}')
+print(f'- From: {address}')
+signed_transaction = client.send(wallet, recipient, amount)
+client.submit(signed_transaction)
+
+txid = signed_transaction['hash']
+print('Hash for transaction:')
+print(txid)
+
+time.sleep(5)
+transaction_status = client.get_transaction_status(txid)
+print('Result for transaction is:')
+print(transaction_status.name)

python/pyproject.toml

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+[tool.poetry]
+name = "xpring-demo"
+version = "1.0.0"
+description = "Demonstration of xpring-py"
+authors = ["Xpring Engineering"]
+license = "MIT"
+
+[tool.poetry.dependencies]
+python = "^3.6"
+xpring = {version = "^0.4.3", extras = ["py"]}
+
+[tool.poetry.dev-dependencies]
+
+[build-system]
+requires = ["poetry>=0.12"]
+build-backend = "poetry.masonry.api"