Include alpha blending mode

Co-authored-by: sigonasr2 <sigonasr2@gmail.com>

main.cpp

@@ -12,16 +12,17 @@ public:
 public:
 	bool OnUserCreate() override
 	{
+		SetPixelMode(olc::Pixel::ALPHA);
 		// Called once at the start, so create things here
+		for (int x = 0; x < ScreenWidth(); x++)
+			for (int y = 0; y < ScreenHeight(); y++)
+				Draw(x, y, olc::Pixel(rand() % 255, rand() % 255, rand()% 255));	
 		return true;
 	}
 
 	bool OnUserUpdate(float fElapsedTime) override
 	{
 		// called once per frame
-		for (int x = 0; x < ScreenWidth(); x++)
-			for (int y = 0; y < ScreenHeight(); y++)
-				Draw(x, y, olc::Pixel(rand() % 255, rand() % 255, rand()% 255));	
 		return true;
 	}
 };