Added YouTube Downloader application to this repo

Applications/YouTube Downloader/YouTube_Donlowder.py

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+from pytube import YouTube
+from tkinter import *
+from pytube.cli import on_progress
+#Asking for all the video links
+n = int(input("Enter the number of youtube videos you want to download:"))
+# A list to store all the links
+links = []
+# Asking for the links one per line
+print("\nEnter every one of the links in individual line:")
+for i in range(0, n):
+    temp = input()
+    links.append(temp)
+#Showing all details for videos and downloading them one by one
+for i in range(0, n):
+    link = links[i]
+    yt = YouTube(link,on_progress_callback=on_progress)
+    print(yt)
+    print("\nDetails for Video", i+1, "\n")
+    print("Video's Title:   ", yt.title)
+    print("Number of views:  ", yt.views)
+    print("video's Length:  ", yt.length, "seconds")
+
+    # Filter to select only progressive streams
+    stream = str(yt.streams.filter(progressive=True))
+    stream = stream[1:]
+    stream = stream[:-1]
+    streamlist = stream.split(", ")
+    print("\nAll available options for downloads:\n")
+
+    # loop around all available streams and print them for user to decide
+    for i in range(0, len(streamlist)):
+        st = streamlist[i].split(" ")
+        print(i+1, ") ", st[1], " and ", st[3], sep='')
+
+
+    # ask user the tag forthe stream to download
+
+    '''
+    272: webm video 2880p/4320p
+    94: mp4 video 144p
+    395: mp4 video 240p
+    396: mp4 video 360p
+    397: mp4 video 480p
+    398: mp4 video 720p
+    399: mp4 video 1080p
+    400: mp4 video 1440p
+    401: mp4 video 2160p
+    402: mp4 video 2880p
+    298: mp4 video 720p60
+    299: mp4 video 1080p60
+    '''
+
+    tag = int(input("\nEnter the itag of your preferred stream to download:   "))
+    ys = yt.streams.get_by_itag(tag)
+    print("\nDownloading...")
+
+
+
+    ys.download()
+    print("\nDownload completed :)")
+    print()
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