add a method to download an article

tests/test_download.py

@@ -1,7 +1,10 @@
-import url2markdown
+from newspaper import Article
+from url2markdown.downloader import downloader
+
 
 def test_get_content():
-    assert False
+    article = downloader('https://newspaper.readthedocs.io/en/latest/user_guide/quickstart.html')
+    assert type(article) == Article
 
 
 def test_convert_html_to_markdown():

url2markdown/downloader.py

@@ -0,0 +1,7 @@
+from newspaper import Article
+
+
+def downloader(url):
+    article = Article(url)
+    article.download()
+    return article