misc: Move library into payloads parent folder

payloads/library/persistence/WIN_AddAdmin/README.md

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+# Back Door Account
+### Add an account to an unlocked PC before the keystrokes are caught
+---
+Simple script that adds an administrative user for later access. Only works, of course, if the PC is unlocked. However this is a nice complement to the SkeletonKey payload: just add the new user when you unlock the PC.
+
+The payload was tested on Windows 10.
+
+*Setup*
+1. Connect the Key Croc and place into arming mode
+2. Place `addadmin.txt` in the payloads directory
+3. Change the `BACKDOOR_USER` variable to something that will blend into the environment
+4. Change the `BACKDOOR_PASS` variable to a reasonably strong password
+5. Optionally change the MATCH string to a unique passphrase of your choice
+6. Eject the Key Croc safely
+
+The Key Croc is ready for deployment.
+
+*Deploy*
+1. Connect the Key Croc to target in attack configuration
+2. If you are lucky enough to find yourself at an unlocked screen, type `__addadmin`
+3. With some luck, your user name and password will be added
+
+*Cleanup*
+1. Remove the user from the admin group: `net localgroup administrators officeadmin /delete`
+2. Remove the user from the system: `net users officeadmin /delete`
+
+*What’s up with the name SaintCrossbow?*
+Most of it is because it wasn’t taken. Other than that, I’m a big fan of the literary Saint by Leslie Charteris: a vigilante type who very kindly takes on problem people, serves his own justice, and has a great deal of fun doing it. Also, I just can’t help but think that crossbows are cool.
+
+