add docs

examples/sythetic.py

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+from aiomql import ForexSymbol, Order, Trader, Account
+import asyncio
+
+
+async def main():
+    async with Account():
+        les = ForexSymbol(name='Volatility 50 (1s) Index')
+        # t = ForexSymbol(name='EURUSD')
+        await les.init()
+        # await t.init()
+        await les.info_tick()
+        # await t.info_tick()
+        vol = await les.compute_volume(amount=50, pips=10)
+        print(les.tick.ask, les.tick.bid, les.volume_min, vol, les.point, les.digits, les.volume_max)
+        print(les.tick.ask + les.point*100)
+
+asyncio.run(main())