add readme

Dockerfile

@@ -1,3 +1,3 @@
 from container-registry.oracle.com/database/free:23.3.0.0
-COPY docker-entrypoint.sh /usr/local/bin/
+COPY --chmod=777 docker-entrypoint.sh /usr/local/bin/
 ENTRYPOINT ["docker-entrypoint.sh"]

README.MD

@@ -0,0 +1,21 @@
+# ORACLEDB-INIT
+
+ORACLEDB-INIT is designed to initialize a schema within an Oracle database if it does not already exist. It utilizes SQL*Plus to execute SQL commands within the Oracle database environment.
+
+The script executed within the Docker container performs the following actions:
+
+1. Checks if the specified user exists in the database.
+2. If the user does not exist, it creates the user with the provided username and password.
+3. Grants necessary privileges to the created user.
+
+## Usage
+
+`docker run -e ADMIN_USER=<admin_user> -e ADMIN_PASSWORD=<admin_password> -e DB_USER=<db_user> -e PASSWORD=<db_password> -e dsn=<connection_string> oracledb-init`
+
+## Environment Variables
+
+- `ADMIN_USER`: The admin username of the Oracle database.
+- `ADMIN_PASSWORD`: The admin password of the Oracle database.
+- `DB_USER`: The username of the schema to be initialized.
+- `PASSWORD`: The password for the new schema.
+- `DSN`: The Oracle Data Source Name (DSN) for connection.