Made POJO out of Article class
Made POJO out of Article class

Article class should contain all information regarding an article.
The missing information is added.
Also, all setters and getters are added, thereby making this class
a POJO (plain old java object).

Signed-off-by: Neha Bagari <da5cf7d44773e2aef2bc8c75839dbf1408c63b83@iitbhu.ac.in>

venkateshshukla/th-editorial-android