docs: Add gnu patch install script for Steam Deck (#1285)

README.md

@@ -225,6 +225,11 @@ chmod +x ~/.local/bin/aria2c
 curl -L https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp -o ~/.local/bin/yt-dlp
 chmod +x ~/.local/bin/yt-dlp
 
+mkdir ~/.patch
+curl -o ~/.patch/patch.tar.zst https://mirror.sunred.org/archlinux/core/os/x86_64/patch-2.7.6-10-x86_64.pkg.tar.zst
+tar xvf ~/.patch/patch.tar.zst -C ~/.patch/
+cp ~/.patch/usr/bin/patch ~/.local/bin/
+
 git clone https://github.com/pystardust/ani-cli.git ~/.ani-cli
 cp ~/.ani-cli/ani-cli ~/.local/bin/
 
@@ -272,6 +277,15 @@ curl -L https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp -o ~/.l
 chmod +x ~/.local/bin/yt-dlp
 ```
 
+##### Install [patch](https://savannah.gnu.org/projects/patch/) (needed for self-update feature [ -U ] ):
+
+```sh
+mkdir ~/.patch
+curl -o ~/.patch/patch.tar.zst https://mirror.sunred.org/archlinux/core/os/x86_64/patch-2.7.6-10-x86_64.pkg.tar.zst
+tar xvf ~/.patch/patch.tar.zst -C ~/.patch/
+cp ~/.patch/usr/bin/patch ~/.local/bin/
+```
+
 ##### Install ani-cli:
 
 ```sh
@@ -393,6 +407,7 @@ apk del grep sed curl fzf git aria2 ffmpeg ncurses
 - ffmpeg - m3u8 Downloader (fallback)
 - fzf - User interface
 - ani-skip (optional)
+- patch - Self updating
 
 ### Ani-Skip