Explain changes in README

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+CS-107 - Project 2: Maze
+========================
+
+My JAVAmazing Maze.
+
+
+Maze and Daedalus entities implementation
+-----------------------------------------
+
+### Use of Sets
+
+The choices arrays have been replaced by Sets of Direction in order to guarantee the uniqueness of each possibility and
+directly provide common collection methods, avoiding costly systematic conversions from array to Collection and vice
+versa.
+
+The old methods returning and taking as parameter arrays of Direction have been kept and deprecated to keep the
+compatibility with the provided and hidden classes and tests.
+
+
+### Strategies
+
+Choices elimination and picking strategies have been implemented as "traits" (interfaces with default method in Java)
+enabling a better modularization, avoiding code duplication between animals sharing identical behaviours pieces in their
+decision making process.
+
+
+### DaedalusAware interface
+
+Some code shared by the Predator and the Prey classes has been factored in the DaedalusAware interface as default
+methods.
+
+
+### Ghosts
+
+An intermediate Ghost class has been inserted between ghosts and the Predator class in the inheritance chain in order to
+implement common behaviours such as the chase mode and the common prey selection and targeting.
+
+
+### PacMan
+
+The strategy implemented for PacMan to live as long as possible is to simply navigating by maximizing the distance to
+the closest Predator.
+
+
+"Utilities" additions and modifications
+---------------------------------------
+
+### Direction
+
+A set of the possible moving directions (excluding the NONE Direction) has been added the the Direction enum class.
+
+
+### Vector2D
+
+A zero vector constructor has been added the the Vector2D class.
+
+
+### SimulationGenerator
+
+The simulation generating functions have been moved from the main programs to this utility class.
+
+
+### Trail
+
+A Trail class handling the Panda's marking has been added.
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-CS-107 - Project 2: Maze