Modified README file

Author: gorvk

README.md

@@ -1,3 +1,35 @@
-# Space Invaders
+# **Space Invaders**
 
-Copy of Space Invaders tried using Pygame.
+***Copy of Space Invaders tried using Pygame.<br>A arcade style game where player have to shoot aliens which are attacking on our planet before they touch the ground. 
+<br>Player can play this game endless and keep increasing the score.***
+<br>
+<br>
+
+## **Game Mechanism** :
+Bullet are drawn infinitly on the screen. When the bullet is fired it's postion at y-axis decreases which feels like bullet is fired and moving forward.
+<br>Player can shoot one bullet at a time unill it reaches the 0th position at y-axis, it gets reset to the orginial position at y-axis from where it was shoot<br> and x-axis where player is located. 
+<br>This reseting of bullet works same when it hits any enemy.
+<br>Enemies are drawn randomly at the starting of the game and when a bullets hit them.<br>
+<br>
+
+## **Programming Languages and Modules** :
+**Python** : This game is purely made in Python Programming Language.<br>
+**Pygame**: Pygame is a module provided by Python to create games in Python Programming Language.<br>(Link to Official Documentation is given below in Resources and References section).<br>
+<br>
+<img src = "./images/README-images/Game-Play.png" width=400><br>
+
+## **Keyboard keys for Player movement** : <br>
+<kbd>A</kbd> is used for moving player to the Left.<br>
+<kbd>D</kbd> is used for moving player to the Right.
+
+## **Mouse key for firing bullet** : <br>
+<kbd>Left Mouse Key</kbd> is used for Firing Bullets at enemy.<br>
+<br>
+
+## **Resources and References** : <br>
+* **FreeCodeCamp Youtube Channel** - [Pygame Tutorial](https://www.youtube.com/watch?v=FfWpgLFMI7w).<br>
+* **Pygame Official Website** - [Pygame Documentation](https://www.pygame.org/docs/).<br>
+* **Make8bitart Official Website** - [8-bit Image making Tool](https://make8bitart.com/).<br>
+* **Flaticon Official Website** - [Free Images and Icons](https://www.flaticon.com/).<br>
+* **Google Fonts** - [Press Start 2P font by CodeMan38](https://fonts.google.com/specimen/Press+Start+2P).<br>
+* **Reduceimages Official Website** - [Image size converter in Pixels and Percentage](https://www.reduceimages.com/).

images/README-images/Game-Play.png

@@ -4,15 +4,15 @@
 
 class Player:
     def __init__(self, xPlayer, yPlayer):
-        self.img = pygame.image.load('./images/player1.png')
+        self.img = pygame.image.load('./images/player.png')
         self.xPlayer = xPlayer
         self.yPlayer = yPlayer
         self.playerSpeed = 11
 
 class Enemy(pygame.sprite.Sprite):
     def __init__(self, xEnemy, yEnemy):
         super().__init__()
-        self.image = pygame.image.load('./images/enemy2.png')
+        self.image = pygame.image.load('./images/enemy.png')
         self.rect = self.image.get_rect()
         self.xEnemy = xEnemy
         self.yEnemy = yEnemy