Update README.md

README.md

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 # annepro2_flasher_c
 This is cli utility for flash annepro2 keyboard, rewriten from existing one (from Rust to clear C)
+
+---
+
+## Dependencies
+
+To build this project externally, you only need **hidapi** — specifically the *hidapi-hidraw* variant (header files and linkable library).
+
+> Note:  
+> - In most cases, `hidapi-hidraw` is used by default.  
+> - If you specifically need `hidapi-libusb`, package names may differ.  
+> - On Debian 11+ and Ubuntu 20.04+, `libhidapi-dev` defaults to `hidraw`.
+
+### Installing `hidapi` development package
+
+| Distribution         | Install Command                                                                 |
+|----------------------|----------------------------------------------------------------------------------|
+| **Debian/Ubuntu**    | `sudo apt install libhidapi-dev`                                                |
+| **Fedora**           | `sudo dnf install hidapi-devel`                                                 |
+| **CentOS/RHEL**      | `sudo yum install hidapi-devel`                                                 |
+| **Arch Linux/Manjaro** | `sudo pacman -S hidapi`                                                       |
+| **Gentoo**           | `sudo emerge dev-libs/hidapi`                                                   |
+| **Void Linux**       | `sudo xbps-install -S libhidapi-devel`                                          |
+| **Nix/NixOS**        | `nix-shell -p hidapi` *(or add `hidapi` to `buildInputs`)*                      |
+| **Alpine Linux**     | `sudo apk add hidapi-dev`                                                       |
+| **Slackware**        | via SlackBuilds or sbopkg: `sbopkg -i hidapi`                                   |
+
+<details>
+<summary>Example `shell.nix` for Nix/NixOS</summary>
+
+```nix
+{ pkgs ? import <nixpkgs> {} }:
+pkgs.mkShell {
+  buildInputs = [ pkgs.hidapi ];
+}
+```
+</details>
+
+## Build instructions
+  1. Install dependencies
+  2. Do this in your terminal
+
+    git clone https://github.com/YOUR_USERNAME/annepro2-tools-c.git
+    cd annepro2-tools-c
+    make
+    sudo make install
+
+## Usage 
+To flash firmware:
+```bash
+annepro2_flasher_c ./my_firmware.bin
+```
+
+To flash light processor:
+```bash
+annepro2_flasher_c -t led ./my_led_firmware.bin
+```
+
+To flash bluetooth firmware:
+```bash
+annepro2_flasher_c -t ble ./my_ble_firmware.bin
+```
+If you want auto reboot keyboard after flash just add ```--boot``` parameter:
+```bash
+annepro2_flasher_c --boot ./my_firmware.bin
+```
+If run without arguments, the tool displays a help message with all available options.
+
+> The tool will wait up to 10 seconds for the keyboard to enter IAP mode.
+> To do this: unplug the keyboard, hold ESC, then plug it back in.
+
+## P.S.
+  I am not responsible for broken keyboards. Use this program at your own risk.
+