📝 Update docs, add first tutorials

docs/tutorial/src/all/tutorial055.py

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+from fastapi import FastAPI
+
+from sqlalchemy import Boolean, Column, Integer, String, create_engine
+from sqlalchemy.ext.declarative import declarative_base, declared_attr
+from sqlalchemy.orm import scoped_session, sessionmaker
+
+# SQLAlchemy specific code, as with any other app
+
+
+SQLALCHEMY_DATABASE_URI = "postgresql://user:password@postgresserver/db"
+
+# By creating this a CustomBase class and inheriting from it, your models will have
+# automatic __tablename__ attributes. So you don't have to declare them.
+# So, your models will behave very similarly to, for example, Flask-SQLAlchemy
+
+
+class CustomBase:
+    # Generate __tablename__ automatically
+    @declared_attr
+    def __tablename__(cls):
+        return cls.__name__.lower()
+
+
+Base = declarative_base(cls=CustomBase)
+
+
+class User(Base):
+    # Own properties
+    id = Column(Integer, primary_key=True, index=True)
+    email = Column(String, unique=True, index=True)
+    hashed_password = Column(String)
+    is_active = Column(Boolean(), default=True)
+
+
+engine = create_engine(SQLALCHEMY_DATABASE_URI, convert_unicode=True)
+db_session = scoped_session(
+    sessionmaker(autocommit=False, autoflush=False, bind=engine)
+)
+
+
+def get_user(username, db_session):
+    return db_session.query(User).filter(User.id == username).first()
+
+
+# FastAPI specific code
+app = FastAPI()
+
+
+@app.get("/users/{username}")
+def read_user(username: str):
+    user = get_user(username, db_session)
+    return user