Update README.md

Author: ummayrr

README.md

@@ -8,9 +8,47 @@ ups and use special abilities to defeat the bosses. This game is created with C+
 
 The game is primarily designed to utilize Object Oriented Programming concepts. Therefore it relies very little on the pre-defined SFML features of graphics, but the core mathematical procedures in the code, which produce the visuals and the animations.
 
-- Three huges levels with variety of phases and enemies, with difficulty increase in each level.
-- Boss fights, including Monsters, Dragons and a secret boss.
+- Three huge levels with variety of phases with difficulty increase in each phase. The phases in each level include three types of enemies: Alpha Invaders, Beta Invaders and Gamma Invaders.
+- Each phase has different shapes. Level 1 includes the preliminary shapes such as rectangle, triangle and cross sign. Level 2 includes the advanced shapes such as circle, diamond and heart. Level 3 includes the combination of both the preliminary and advanced shapes but these
+shapes would be filled.
+- Boss fights, including Monsters, Dragons and a secret boss. Each boss has different patterns and different kind of attacks they can damage the player with.
+- Lives system, there are 3 Lives a player has, before the ship blasts.
+- Player can make use of addons, which fall at random intervals from above. Included addons: Life, Danger Sign, PowerUp, Enhanced Fire. Player ship and Bullets are upgraded according to the addon gained temporarily.
 - Scoring functionality, the highscores are saved using File Handling utilizng fstream library. The top 3 positions are awarded medals which can are displayed when they are playing the game.
+- Many misc details and animations, such as the galaxy is a wrap-around environment for the spaceship i.e., a spaceship disappears at one corner of the screen and then reappears from the
+exact opposite corner, periodic damage to the ship, and screen shake etc.
+- The game features fully functional audio and sound effects. Music can be turned on or off from the menu.
+- The game includes following screens:
+1. Game Menu screen
+2. Instructions screen
+3. Main Screen for gameplay
+4. Pause Screen/Functionality
+5. High Score and Players Names Display
+6. End screen
+
+## Gameplay Instructions
+
+The player of the game controls a spaceship in an enemy filled space field. The goal is to destroy
+the enemy ships, avoiding a collision with any of them. The spaceship can fire bullets to destroy the objects in
+the space field. The spaceship is destroyed in case of a collision with an object (enemy ships) or
+impact with a bomb fired by the enemy ship. Similarly, the dragon appears after a random
+interval whereby its position is fixed, however, it could fire in 3 directions (downwards,
+right-downwards and left-downwards). The direction of the fire would also be decided on the
+basis of the position of the spaceship i.e. the dragon would fire in the zone where the spaceship
+is currently located. On the other hand, the monster’s vertical position is fixed however it can
+move in left and right directions. The monster will throw a beam of lightning on the spaceship
+after regular intervals.
+
+The player can move the spaceship in any direction (right, left, up, down and diagonally). The
+spaceship moves in all possible directions. As an advanced move, a player can boost the
+spaceship into powerup mode, i.e. a spaceship cannot be destroyed and fire a continuous beam
+of bullets instead of periodic intervals.  At the start of the game, the shape of the enemies in the space field is
+randomly selected. The number of enemies will be selected on the basis of that shape. Next
+level is achieved once all enemies in the current field are destroyed. The next level starts with a
+different shape and an increased number of enemies in the space field. The player is awarded
+three lives initially. A life is decreased if the spaceship is destroyed. The player gets points for
+hitting the objects. The number of remaining lives, and the score is displayed on the top of the
+screen.
 
 ## Installation: