docs: init README

README.md

@@ -1,2 +1,30 @@
 # appdupe
 a cli tool to duplicate iOS apps "correctly"
+
+## requirements
+python v3.8 or later, the `zip` command, and [ldid](https://github.com/ProcursusTeam/ldid) installed globally. installing [pyzule](https://github.com/asdfzxcvbn/pyzule) is an easy way to get this taken care of.
+
+windows is not supported. use wsl.
+
+## usage
+```shell
+$ python appdupe.py -h
+usage: appdupe.py [-h] -i input -o output [-s seed]
+
+a cli tool to duplicate ios apps
+
+options:
+  -h, --help  show this help message and exit
+  -i input    ipa to duplicate
+  -o output   duplicated ipa to create
+  -s seed     a "seed" to derive the app id from (any string of your choosing -- will always produce same output)
+```
+
+## notes
+you can use `-s` to ensure multiple apps share the same data container. an example where this can be useful can be [found in the code](https://github.com/asdfzxcvbn/appdupe/blob/d6711fde846ea9c9be3d133b2b82299fa3675d04/appdupe.py#L45).
+
+this is really messy. i made this without caring about quality so there's probably some bugs.. who cares though, it works, doesn't it?
+
+also, there might be some remaining shared app containers due to app extensions. you can use [pyzule](https://github.com/asdfzxcvbn/pyzule) to remove app extensions, change the app display name, and modify the app further.
+
+don't change the bundle id though.. not sure if that would break anything due to changing `application-identifier`. you can try if you want and tell me if it works, just open an issue or dm me on telegram or something.