Update README.md

Author: thisisprasad

README.md

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-A file encryption-decryption HTTP server. The server encrypts or decrypts the file present on the server. File encryption and decryption is performed using [Simplified DES](https://www.cs.uri.edu/cryptography/dessimplified.htm#:~:text=Simplified%20DES%20is%20an%20algorithm,on%20blocks%20of%2012%20bits.) algorithm.
+A file encryption-decryption HTTP server. The server encrypts or decrypts the file present on the server. File encryption and decryption is performed using [Simplified DES](https://www.brainkart.com/article/Simplified-Data-Encryption-Standard-(S-DES)_8343/) algorithm.
 The encryption and decryption operation are exposed using REST APIs(The usage is explained below). For efficient routing and implementation of REST APIs gorilla mux server is used.
 
 ## How To Use