docs: Added Gentoo linux installation manual

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Real-ESRGAN models `realesr-general-x4v3` and `realesr-general-wdn-x4v3` (#1319).
+- Installation manual for Gentoo Linux (both cli and qt6).
 
 ## [6.4.0] - 2025-01-24
 

README.md

@@ -78,6 +78,9 @@ Video2X packages are available for the Linux distros listed below. A universal A
   - [archlinuxcn/video2x-git](https://github.com/archlinuxcn/repo/tree/master/archlinuxcn/video2x-git)
   - [archlinuxcn/video2x-qt6](https://github.com/archlinuxcn/repo/tree/master/archlinuxcn/video2x-qt6)
   - [archlinuxcn/video2x-qt6-git](https://github.com/archlinuxcn/repo/tree/master/archlinuxcn/video2x-qt6-git)
+- Gentoo Linux: gentooplusplus repository, mailtained by [@Eugeniusz-Gienek](https://github.com/Eugeniusz-Gienek).
+  - video2x: `emerge -av media-video/video2x::gentooplusplus`
+  - video2x-qt6: `emerge -av media-video/video2x-x11::gentooplusplus`
 - Other distros: `Video2X-x86_64.AppImage` on the [releases page](https://github.com/k4yt3x/video2x/releases/latest).
 
 ## [📦 Container Image](https://docs.video2x.org/running/container.html)

docs/book/src/installing/linux.md

@@ -15,6 +15,31 @@ Video2X packages are available for the Linux distros listed below. If you'd like
   - [archlinuxcn/video2x-qt6](https://github.com/archlinuxcn/repo/tree/master/archlinuxcn/video2x-qt6)
   - [archlinuxcn/video2x-qt6-git](https://github.com/archlinuxcn/repo/tree/master/archlinuxcn/video2x-qt6-git)
 
+## Gentoo
+
+Gentoo users can enable `gentooplusplus` repository, maintained by [@Eugeniusz-Gienek](https://github.com/Eugeniusz-Gienek), and install the packages from there:
+
+```
+# If not done before - install eselect-repository:
+emerge --ask app-eselect/eselect-repository
+# Enabling gentooplusplus repo
+eselect repository enable gentooplusplus
+emerge --sync
+# (optional) check the use flags and enable the ones which make sense for you.
+equery u media-video/video2x::gentooplusplus
+# Installing of a CLI version - resulting executable is /usr/bin/video2x
+emerge -av media-video/video2x::gentooplusplus
+# If GUI is needed (resulting executable is /usr/bin/video2x-qt6), you can install it as well:
+emerge -av media-video/video2x-x11::gentooplusplus
+###
+# P.S. if you don't have any other repositories which have video2x inside them,
+# the repo postfix can be skipped - e.g. after enabling the repo you can just do:
+# equery u media-video/video2x
+# emerge -av media-video/video2x
+# emerge -av media-video/video2x-x11
+# Which might be a bit more convenient.
+```
+
 ## Other Distros
 
 Users of other distros can download and use the AppImage from the [releases page](https://github.com/k4yt3x/video2x/releases/latest).