update readme

README.md

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 # downr1n
 downgrade tethered checkm8 idevices ios 14, 15.
+
+# Usage
+
+Example: ./downr1n.sh --downgrade 14.3 
+
+
+    --downgrade         downgrade tethered your device to ios 14,15.
+
+    --dfuhelper         A helper to help get A11 devices into DFU mode from recovery mode
+
+    --boot              this boot the device.
+
+    --fixBoot           that will boot the device using fsboot
+
+    --debug             Debug the script
+
+---
+
+# Dependencies
+- A desactivated passcode on A10-A11 
+- unzip, python3
+- Update or Install libimobiledevice-utils, libusbmuxd-tools
+- A IPSW iOS 14-15 
+- a MACOS or LINUX, it's better that you use a mac it's more estable and faster
+
+# Warnings
+- I am **NOT** responsible for any data loss. The user of this program accepts responsibility should something happen to their device.
+ **If your device is stuck in recovery, please run one of the following:**
+   - futurerestore --exit-recovery
+   - irecovery -n
+
+
+
+
+# Credits
+
+# with love Edwin :)
+
+<details><summary>thanks to</summary>
+<p>
+
+- [Edwin](https://github.com/edwin170) owner :)
+ 
+</details>
+
+<details><summary>Other credits for tools and codes used in downr1n</summary>
+
+- [mineek](https://github.com/mineek/) because sunst0rm
+
+- [exploit](https://github.com/exploit3dguy/) for asrpatcher
+
+- [iSuns9](https://github.com/iSuns9/)
+
+- [Nathan](https://github.com/verygenericname) for the ramdisk
+    
+- [m1sta](https://github.com/m1stadev) for [pyimg4](https://github.com/m1stadev/PyIMG4)
+
+- [tihmstar](https://github.com/tihmstar) for [pzb](https://github.com/tihmstar/partialZipBrowser)/original [iBoot64Patcher](https://github.com/tihmstar/iBoot64Patcher)/original [liboffsetfinder64](https://github.com/tihmstar/liboffsetfinder64)/[img4tool](https://github.com/tihmstar/img4tool)
+
+- [xerub](https://github.com/xerub) for [img4lib](https://github.com/xerub/img4lib) and [restored_external](https://github.com/xerub/sshrd) in the ramdisk
+
+- [libimobiledevice](https://github.com/libimobiledevice) for several tools used in this project (irecovery, ideviceenterrecovery etc), and [nikias](https://github.com/nikias) for keeping it up to date
+
+- [Ralp0045](https://github.com/Ralph0045/Kernel64Patcher) amazing dtree_patcher and kernel64patcher ;)
+
+</p>
+</details>