Update README.md

Author: sabrineeel

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-# oracle-db-management
+## oracle-db-management
+
+This assignment focuses on the administration and management of an Oracle database. It is structured into several parts:
+
+1-Creation of Tablespaces and Users
+2-Data Definition Language (DDL)
+3-Data Manipulation Language (DML)
+4-User Management
+5-Data Dictionary
+
+The objective is to master user management, data manipulation, and query optimization in Oracle SQL.
+## 👩‍💻 Auteurs
+Nait cherif Sabrinel