Added homework assignment

Author: colabug

HOMEWORK

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+INSTRUCTIONS
+
+  * Fork this repository to complete the homework assignment.
+  * Add or update your code for each of the activities below.
+  * When finished, push your work to your github account.
+  * We will review the homework and any questions you may have about the
+    assignment at the beginning of class 2.
+
+HOMEWORK
+
+  1. Add another penguin to the zoo. It should appear in the list of penguins
+     with out modification to the current output code in the main function
+     of Zoo.
+
+  2. When a penguin eats a fish, the full weight of the fish should not be
+     added to the weight of the penguin (current behavior). Instead add 3/4 the
+     weight of the fish to the penguin's weight.
+
+  3. When a penguin swims, it loses five pounds.
+
+  4. A penguin dies when it weighs 0 pounds. Add a function to check the weight
+     before a penguin swims. Add a way to track if a penguin is dead.
+
+EXTRA CREDIT
+
+  * Add an aquarium to hold fish.
+  * Add three fish to the aquarium with different characteristics.
+  * Add the aquarium to the zoo and add print statements to describe it.
+
+OBJECTIVES
+
+  * Become comfortable with github, checking out a repository, and pushing
+    changes to github.com.
+  * Become familiar with IntelliJ.
+  * Practice with Java variables, functions, arrays, math operations,
+    and objects.