JAVA-624: Updated READMEs and pom for new module

java-collections-maps-3/README.md

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+## Java Collections Cookbooks and Examples
+
+This module contains articles about Map data structures in Java.
+
+### Relevant Articles: 
+- [Java TreeMap vs HashMap](https://www.baeldung.com/java-treemap-vs-hashmap)
+- [Comparing Two HashMaps in Java](https://www.baeldung.com/java-compare-hashmaps)
+- More articles: [[<-- prev>]](/java-collections-maps-2)

java-collections-maps-3/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>
+    <artifactId>java-collections-maps-3</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>java-collections-maps-3</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-java</relativePath>
+    </parent>
+
+    <dependencies>
+        
+    </dependencies>
+
+    <properties>
+        
+    </properties>
+
+</project>