update ssh-keygen with exploit code

[Zeeshan12340]

Added exploit code to ssh-keygen in the description section. Built the project with addition locally and this is how it looks:

[Siddhartha2300032769]

+The C_GetFunctionList() function contains the code you want to execute when the library is loaded. In this case, it executes /bin/sh with root privileges.
We're using the setuid(0) function to set the effective UID to root before executing the command. This is done to ensure the command executes with root privileges.
+The attribute((constructor)) directive is used to define a constructor function that will be executed when the library is loaded. In this case, it's used to call C_GetFunctionList() when the library is loaded.