added readme

Author: harshareddy794

Web-Scraping/links extractor/README.md

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+# links extractor script
+Links extractor is a python script which helps in extracting all the links in a web page. 
+It goes through all the content in html data and extract data from all anchor tags.
+
+## Libraries used
+urllib is a python library used to send request used to website to retrive html content
+
+bs4 is used to extract data from html content
+
+xlwt is a python library used to write data to excel sheet