Add iotdb sqlalchemy image (#33)

diff --git a/docs/UserGuide/API/IoTDB-SQLAlchemy/sqlalchemy-to-iotdb.png b/docs/UserGuide/API/IoTDB-SQLAlchemy/sqlalchemy-to-iotdb.png
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+++ b/docs/UserGuide/API/IoTDB-SQLAlchemy/sqlalchemy-to-iotdb.png
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