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add more advanced features to steganography tutorial 2

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`@@ -39,3 +39,21 @@ To run this:`
`39`	`39`	`[+] Decoding...`
`40`	`40`	`[+] Decoded data: This is some secret data.`
`41`	`41`	```
	`42`	`+`
	`43`	+- To encode the `foo.pdf` file into the `image.PNG` image:
	`44`	+ ```
	`45`	`+ $ python steganography_advanced.py -e image.PNG -f foo.pdf -b 1`
	`46`	+ ```
	`47`	`+ Output:`
	`48`	+ ```
	`49`	`+ [*] Maximum bytes to encode: 125028`
	`50`	`+ [*] Data size: 84158`
	`51`	`+ [*] Encoding data...`
	`52`	`+ [+] Saved encoded image.`
	`53`	+ ```
	`54`	+- Now decoding it into a file `foo_decoded.pdf`:
	`55`	+ ```
	`56`	`+ python steganography_advanced.py -d image_encoded.PNG -f foo_decoded.pdf -b 1`
	`57`	`+ [+] Decoding...`
	`58`	`+ [+] File decoded, foo_decoded.pdf is saved successfully.`
	`59`	+ ```

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