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.

.gitignore

@@ -0,0 +1,45 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+.kotlin
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
+
+### Application Specific ###
+application-local.properties
+*.db
+pipes/
+*.log