Update README.md

readme update

Author: proletesseract

README.md

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 Simple AES Encryption tool to password protect any information. It can encrypt as well as decrypt, render a QR code of the encrypted information and also print a formatted page with all the relevant data to a PDF file or printer.
 
+Inputting your private keys into third party software can be a great way to get your keys stolen by malicious actors. Please use this tool with extreme caution. Check the checksum and signature before using this software. 
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+You or other software engineers whom you trust can review the code and compile it from source yourself. 
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+All encryption is done locally, nothing is broadcast. This application can be used completely offline. 
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+As an added layer of security / paranoia, you can run this software offline inside a VM or USB booted operating system (which is subsequently destroyed) to make absolutely sure it doesn't broadcast anything.
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+This software is free, open source and provided under the [MIT license](https://opensource.org/licenses/MIT)
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 ### Test data
 
 Unencrypted Data: Sometimes I eat peanut butter from the jar with a spoon