updated screenshot in readme

Author: deltanode

README.md

@@ -1,7 +1,14 @@
 # Space-Invaders
-This is a space invader game developed using python.
+This is a space invader game developed using python.  
+<br/>
+
+![Screenshot](img/screenshot.png "Screen1")
 
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+
+
+
+
 ## Usage
 
 1. Open your Terminal/cmd
@@ -16,6 +23,7 @@ __________________________________________________________________________
 
 or Execute:
 
+
 ```
 SpaceInvaders.cmd
 ```