[JAVA-22519] Move articles from generic libraries module to specific library modules (#15416)

Author: panos-kakos

akka-modules/akka-actors/README.md

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+## Akka HTTP
+
+This module contains articles about Akka actors. 
+
+### Relevant articles:
+
+- [Introduction to Akka Actors in Java](https://www.baeldung.com/akka-actors-java)

akka-modules/akka-actors/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>akka-actors</artifactId>
+    <name>akka-actors</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>akka-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.typesafe.akka</groupId>
+            <artifactId>akka-actor_${scala.version}</artifactId>
+            <version>${typesafe-akka.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.typesafe.akka</groupId>
+            <artifactId>akka-testkit_${scala.version}</artifactId>
+            <version>${typesafe-akka.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <typesafe-akka.version>2.5.11</typesafe-akka.version>
+    </properties>
+
+</project>