add readme file and example screenshot

README.md

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+# 12to11 for Fedora and Enterprise Linux
+
+This repository contains the RPM packaging for [12to11](https://github.com/fish4terrisa-MSDSM/12to11), a Wayland-to-X11 protocol translator. Packages are built in the [andersrh/12to11 COPR project](https://copr.fedorainfracloud.org/coprs/andersrh/12to11/).
+
+## What is 12to11?
+
+12to11 is a small Wayland compositor that runs as a regular X11 client. It creates a Wayland socket and displays Wayland applications as normal X11 windows. This makes it possible to run Wayland-only applications, such as [Waydroid](https://waydro.id/), from an X11 session without running Weston as a nested compositor.
+
+The package is built with EGL/OpenGL ES 2.0 rendering enabled. 12to11 also implements the Wayland data-device and X11 selection handling needed for clipboard integration between Wayland applications and the X11 desktop.
+
+This package tracks the actively developed [fish4terrisa-MSDSM fork](https://github.com/fish4terrisa-MSDSM/12to11) and is licensed under GPL-3.0-only.
+
+## Example: Waydroid running through 12to11
+
+The following screenshot shows Waydroid running as a Wayland application through 12to11 on an X11 desktop:
+
+![Waydroid running through 12to11](screenshots/waydroid%20on%2012to11.png)
+
+## Supported targets
+
+The COPR project currently provides builds for:
+
+- Fedora 43, Fedora 44, Fedora 45, and Fedora Rawhide
+- EPEL 9 and EPEL 10
+- AlmaLinux 10 with EPEL (x86_64-v2)
+
+The COPR builds are unofficial and are provided as-is.
+
+## Installation from COPR
+
+The `dnf copr` command is provided by `dnf-plugins-core`. Install it first if it is not already available.
+
+### Fedora
+
+```bash
+sudo dnf install -y dnf-plugins-core
+sudo dnf copr enable andersrh/12to11
+sudo dnf install -y 12to11
+```
+
+### AlmaLinux, RHEL-compatible distributions, and EPEL
+
+The EL builds use `libXpresent` from the [xlibre/xlibre-xserver COPR](https://copr.fedorainfracloud.org/coprs/g/xlibre/xlibre-xserver/), because `libXpresent` is not available in the standard EL repositories.
+
+On AlmaLinux, install and enable EPEL if necessary, then enable both COPR repositories:
+
+```bash
+sudo dnf install -y epel-release dnf-plugins-core
+sudo dnf copr enable @xlibre/xlibre-xserver
+sudo dnf copr enable andersrh/12to11
+sudo dnf install -y 12to11
+```
+
+On RHEL-compatible distributions where `epel-release` is not available directly, enable EPEL using the distribution's documented procedure before installing 12to11.
+
+## Running 12to11 with Waydroid
+
+Start 12to11 in an X11 session. The `-printsocket` option prints the Wayland socket name while the compositor continues running:
+
+```bash
+RENDERER=egl 12to11 -printsocket
+```
+
+For example, it may print:
+
+```text
+wayland-1
+```
+
+Keep that process running. In another terminal, use the socket name printed by 12to11:
+
+```bash
+export WAYLAND_DISPLAY=wayland-1
+waydroid show-full-ui
+```
+
+If 12to11 prints a different socket name, use that name instead. Do not assume that the socket is always `wayland-1`.
+
+If the Waydroid session is not already running, start it before showing the UI:
+
+```bash
+waydroid session start
+```
+
+The exact Waydroid setup still depends on the Android image, kernel support, graphics driver, and whether Google Apps are installed.
+
+## Building the RPM locally
+
+The spec file uses the upstream GitHub snapshot and the project's legacy `imake`/`xmkmf` build system. The package is built with EGL support enabled by the upstream `12to11.conf`.
+
+### 1. Install packaging tools
+
+Fedora:
+
+```bash
+sudo dnf install -y rpm-build rpmdevtools dnf-plugins-core
+```
+
+AlmaLinux, RHEL-compatible distributions, and EPEL:
+
+```bash
+sudo dnf install -y epel-release rpm-build rpmdevtools dnf-plugins-core
+sudo dnf copr enable @xlibre/xlibre-xserver
+```
+
+### 2. Install the build dependencies
+
+Run this from the repository checkout:
+
+```bash
+sudo dnf builddep -y 12to11.spec
+```
+
+On EL systems, the xlibre COPR must be enabled first so that `libXpresent-devel` can be resolved.
+
+### 3. Build the package
+
+```bash
+rpmdev-setuptree
+cp 12to11.spec ~/rpmbuild/SPECS/
+spectool -g --directory ~/rpmbuild/SOURCES ~/rpmbuild/SPECS/12to11.spec
+rpmbuild -ba ~/rpmbuild/SPECS/12to11.spec
+```
+
+The resulting files are written to:
+
+```text
+~/rpmbuild/RPMS/$(uname -m)/
+~/rpmbuild/SRPMS/
+```
+
+Install the locally built package with:
+
+```bash
+sudo dnf install ~/rpmbuild/RPMS/$(uname -m)/12to11-0-*.rpm
+```
+
+### Building in COPR
+
+COPR reads `12to11.spec`, downloads the source archive specified by `Source0`, installs the `BuildRequires`, and builds the package in a clean chroot for each enabled target. The EL builds also have the xlibre/xlibre-xserver COPR configured as an external repository so that `libXpresent-devel` is available during the build.
+
+To update the source snapshot, change the `commit` and `snapdate` macros in `12to11.spec`, update the changelog, and submit the changed spec file to the COPR project.
+
+## Known limitations
+
+12to11 is not a complete Wayland compositor. According to the upstream project:
+
+- Touchscreen support is not implemented.
+- Device switching in DMA-BUF feedback is not implemented.
+- It requires X.Org Server 1.20 or later.
+- It works best with a compositing window manager that supports the EWMH frame-synchronization protocol.
+- Upstream testing has primarily been done with GNOME Shell; other window managers may have compatibility issues.
+
+For Waydroid controlled with a mouse on an X11 desktop, the missing touchscreen support is usually not a problem.
+
+## Links
+
+- [12to11 upstream project](https://github.com/fish4terrisa-MSDSM/12to11)
+- [12to11 COPR repository](https://copr.fedorainfracloud.org/coprs/andersrh/12to11/)
+- [COPR xlibre/xlibre-xserver repository](https://copr.fedorainfracloud.org/coprs/g/xlibre/xlibre-xserver/)