Adds BfxApi with seed_candles function

bfxapi/examples/get_seed_trades.py

@@ -0,0 +1,16 @@
+import os
+import sys
+import asyncio
+sys.path.append('../')
+
+from bfxapi import Client
+
+bfx = Client(
+  logLevel='INFO'
+)
+
+async def get_seeds():
+  candles = await bfx.rest.get_seed_candles('tBTCUSD')
+  print (candles)
+
+asyncio.get_event_loop().run_until_complete(get_seeds())