Initialize MediaManager-Core project with essential setup:

- Added `.gitignore` for common IDE and build artifacts.
- Configured `pom.xml` with dependencies: PostgreSQL, Hibernate, HikariCP, Log4j 2, Jackson, JUnit 5.
- Created `Media` entity with JPA annotations.
- Added `application.properties` for database and IPC configuration.
- Configured Log4j 2 with console and rolling file appenders.
- Provided `README.md` with setup instructions.
- Included `MediaManagerApplication` class as a starting point.

src/main/resources/META-INF/persistence.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<persistence xmlns="https://jakarta.ee/xml/ns/persistence"
+             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+             xsi:schemaLocation="https://jakarta.ee/xml/ns/persistence
+             https://jakarta.ee/xml/ns/persistence/persistence_3_0.xsd"
+             version="3.0">
+
+    <persistence-unit name="MediaManagerPU" transaction-type="RESOURCE_LOCAL">
+        <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
+
+        <!-- Add entity classes here as they are created -->
+        <!-- <class>com.mediamanager.model.Media</class> -->
+
+        <properties>
+            <!-- Database connection properties will be set programmatically -->
+            <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect"/>
+            <property name="hibernate.hbm2ddl.auto" value="update"/>
+            <property name="hibernate.show_sql" value="false"/>
+            <property name="hibernate.format_sql" value="true"/>
+            
+            <!-- Connection pool settings -->
+            <property name="hibernate.hikari.maximumPoolSize" value="10"/>
+            <property name="hibernate.hikari.minimumIdle" value="2"/>
+            <property name="hibernate.hikari.connectionTimeout" value="30000"/>
+        </properties>
+    </persistence-unit>
+
+</persistence>