Readme and pom file added

core-java-modules/README.md

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+## Core Java Modules
+
+This module contains modules about core Java
+
+## Relevant articles:
+
+- [Multi-Module Maven Application with Java Modules](https://www.baeldung.com/maven-multi-module-project-java-jpms)
+- [Guide to Java FileChannel](https://www.baeldung.com/java-filechannel)
+- [Understanding the NumberFormatException in Java](https://www.baeldung.com/java-number-format-exception)
+- [Will an Error Be Caught by Catch Block in Java?](https://www.baeldung.com/java-error-catch)

core-java-modules/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.ossez.core-java-modules</groupId>
+    <artifactId>core-java-modules</artifactId>
+    <name>core-java-modules</name>
+    <packaging>pom</packaging>
+    
+    <parent>
+        <artifactId>parent-modules</artifactId>
+        <groupId>com.ossez</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <modules>
+        <module>pre-jpms</module>
+        <module>core-java-optional</module>
+        <module>core-java-lang-operators</module>
+        <module>core-java-networking-2</module>
+        <module>core-java-security-manager</module>
+    </modules>
+    
+</project>