Update README.md

Author: abdulkadir-gungor

README.md

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 # python_smtp
 Sending email with python via smtp protocol
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+Files
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+"SMTP_Email.py"  ==>  The file containing the required classes. There are "Add_File" and "SMTP_Email" classes in the file. Thanks to these classes, e-mail can be sent easily.
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+"main.py"  ==>  Includes an example showing how to use the classes in the file named "SMTP_Email.py".
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+Important Warning
+-----------------
+The necessary settings of the e-mail address must be set up. Otherwise, you may have problems sending e-mail.
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+Setting up for Gmail
+---------------------
+[1]
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+![n1](https://user-images.githubusercontent.com/71177413/114061208-dd4d0880-989e-11eb-9ffc-05cc5eeddf4b.JPG)
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+[2]
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+![n2](https://user-images.githubusercontent.com/71177413/114061236-e211bc80-989e-11eb-90bf-e18144ebe0d3.JPG)
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+[3]
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+![n3](https://user-images.githubusercontent.com/71177413/114061263-e8a03400-989e-11eb-9f44-49aca7d957be.JPG)
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+Screenshots of the Code in Operation
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+[1]
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+![n4](https://user-images.githubusercontent.com/71177413/114061703-649a7c00-989f-11eb-83cc-8951f05609bf.JPG)
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+[2]
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+![n5](https://user-images.githubusercontent.com/71177413/114061734-6cf2b700-989f-11eb-8b28-6d0a42cf59fb.JPG)
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+[3]
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+![n6](https://user-images.githubusercontent.com/71177413/114061748-72e89800-989f-11eb-984e-f8a8b930ffff.JPG)
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