Update ALLFUNCTIONS.md

Author: MKM12345

ALLFUNCTIONS.md

@@ -39,3 +39,5 @@ Generates a UUID using version 4 by default but you can choose.
 
 ## external_verbose_output() by @hamdivazim
 If you are printing a lot of data, you can use this method to write the output to log file.
+## get_hash() by @MKM12345
+This takes a string as input, hashes it using the SHA-256 algorithm, and returns the hexadecimal representation of the hash value.