BAEL-1979 Added examples for SnakeYAML Library (#4802)

* BAEL-1979 Added examples for SnakeYAML Library

* BAEL-1979 Moved the snakeyaml related code to libraries module

* BAEL-1979 Removed the System.out.println() statements and converted the assertTrue to assertEquals wherever possible.

* BAEL-1979 Removed println statements, small formatting fix in pom.xml

libraries/src/main/java/com/baeldung/snakeyaml/Address.java

@@ -0,0 +1,41 @@
+package com.baeldung.snakeyaml;
+
+public class Address {
+    private String line;
+    private String city;
+    private String state;
+    private Integer zip;
+
+    public String getLine() {
+        return line;
+    }
+
+    public void setLine(String line) {
+        this.line = line;
+    }
+
+    public String getCity() {
+        return city;
+    }
+
+    public void setCity(String city) {
+        this.city = city;
+    }
+
+    public String getState() {
+        return state;
+    }
+
+    public void setState(String state) {
+        this.state = state;
+    }
+
+    public Integer getZip() {
+        return zip;
+    }
+
+    public void setZip(Integer zip) {
+        this.zip = zip;
+    }
+
+}

libraries/src/main/java/com/baeldung/snakeyaml/Contact.java

@@ -0,0 +1,26 @@
+package com.baeldung.snakeyaml;
+
+public class Contact {
+
+    private String type;
+
+    private int number;
+
+
+    public String getType() {
+        return type;
+    }
+
+    public void setType(String type) {
+        this.type = type;
+    }
+
+    public int getNumber() {
+        return number;
+    }
+
+    public void setNumber(int number) {
+        this.number = number;
+    }
+
+}

libraries/src/main/java/com/baeldung/snakeyaml/Customer.java

@@ -0,0 +1,53 @@
+package com.baeldung.snakeyaml;
+
+import java.util.List;
+
+public class Customer {
+
+    private String firstName;
+    private String lastName;
+    private int age;
+    private List<Contact> contactDetails;
+    private Address homeAddress;
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public List<Contact> getContactDetails() {
+        return contactDetails;
+    }
+
+    public void setContactDetails(List<Contact> contactDetails) {
+        this.contactDetails = contactDetails;
+    }
+
+    public Address getHomeAddress() {
+        return homeAddress;
+    }
+
+    public void setHomeAddress(Address homeAddress) {
+        this.homeAddress = homeAddress;
+    }    
+
+}