Create README.md

Author: Somanyu

attachment-downloader/README.md

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+# Package/Script Name
+
+A python script that automates download of attachments based on various constraints such as file extensions or file name or sender. There is no need of any external library everything is present already.
+
+## Setup instructions
+
+No neeed of any setup just add your email and password in the beginning and mention the path where you want to download the attachments.
+
+## Author(s)
+
+Somanyu
+
+## Disclaimers, if any
+
+Use this section to mention if any particular disclaimer is required