add documentation link

Author: dermasmid

setup.py

@@ -21,13 +21,16 @@
     long_description_content_type = 'text/markdown',
     author = 'Cheskel Twersky',
     author_email = '[email protected]',
-    description = 'Scrape youtube without the official youtube api and without selenium',
+    description = 'Scrape youtube without the official youtube api and without selenium.',
     keywords = 'youtube python channel videos search playlist list get',
     classifiers = [
         "Programming Language :: Python :: 3",
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
     ],
+    project_urls={
+        'Documentation': 'https://scrapetube.readthedocs.io/en/latest/'
+    },
     install_requires = requirements,
     python_requires = '>=3.6',
 )