added quit button to showcase app

data/songtemp.csv

@@ -1,3 +1,3 @@
-1
-18-bye-have-a-great-time.mp3,Applause Wav Sound Effects.mp3,Big_Explosion_Cut_Off.mp3,Big_Explosion_Distant.mp3,Big_Explosion_Sweeping_In.mp3,Bruh Sound Effect.mp3,Bullet_hit_car.mp3,Explosion_Hiss_Bop_Bang.mp3,JUST DO IT Sound Effect.mp3,Long_Rifle_Shots.mp3,M4_Shots.mp3,Strong_Punch-Mike_Koenig-574430706.mp3,are-you-sure-about-that.mp3,bass-boost_mD5uYk1.mp3,bye_imPxcXs.mp3,byebye_v3Dt9ad.mp3,engineer_no01.mp3,hellothere_uIgLvnP.mp3,minion_laughing.mp3,nooo.swf.mp3,obi-wan-hello-there.mp3,oh_no_1.mp3,risitas.mp3,well-be-right-back.mp3
-8.150203704833984
+0
+Lupus Nocte - Hadouken (Royalty Free Music).mp3,Minecraft OST - Pigstep.mp3,The Day You Went Away.mp3,sha la la.mp3
+163.7987518310547

data/temp.csv

@@ -1 +1 @@
-/mnt/storage/SORTED/Music/Videos/Memes + Soundeffect/
+/mnt/storage/SORTED/Music

showcaseScreen/ui/mainui.kv

@@ -14,7 +14,12 @@ LoginWindow:
                 pos_hint: {'x': 0.25, 'y': 0.5}
                 size_hint: 0.5, 0.2
                 id: url
+        GridLayout:
             Button:
                 text: "connect"
                 on_release: 
                     root.connect()
+            Button:
+                text: "Quit"
+                on_release: 
+                    app.stop()