feat: Introduce ASYNC DB as Plug and Play (#16)

Co-authored-by: vikbhas <waraa.vignesh@gmail.com>

creyPY/fastapi/db/async_session.py

@@ -0,0 +1,25 @@
+import os
+from typing import AsyncGenerator
+from dotenv import load_dotenv
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
+from sqlalchemy.orm import sessionmaker
+
+
+load_dotenv()
+
+host = os.getenv("POSTGRES_HOST", "localhost")
+user = os.getenv("POSTGRES_USER", "postgres")
+password = os.getenv("POSTGRES_PASSWORD", "root")
+port = os.getenv("POSTGRES_PORT", "5432")
+name = os.getenv("POSTGRES_DB", "fastapi")
+
+SQLALCHEMY_DATABASE_URL = f"postgresql+psycopg://{user}:{password}@{host}:{port}/"
+
+
+async_engine = create_async_engine(SQLALCHEMY_DATABASE_URL + name, pool_pre_ping=True)
+AsyncSessionLocal = sessionmaker(bind=async_engine, class_=AsyncSession,
+                                expire_on_commit=False, autoflush=False, autocommit=False)
+
+async def get_async_db() -> AsyncGenerator[AsyncSession, None]:
+    async with AsyncSessionLocal() as db:
+        yield db