first assignment

@leapfrog-dipendra  @bhuwang  @anishmanandhar  @adhpawal  @Satish-Gupta  @Msanjib  @nerisa  @utsabneupane 
Maintain Class Level JavaDoc and MEthod/Function level Javadoc in all of your code.  
See this example. http://www.docjar.net/html/api/java/util/Collections.java.html