Add README.md

Author: NexusSfan

README.md

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+# Devuan Repository for XLibre
+
+```sh
+sudo apt-get update
+sudo apt-get install -y ca-certificates curl
+
+sudo install -m 0755 -d /usr/share/keyrings
+curl -fsSL https://mrchicken.nexussfan.cz/publickey.asc | gpg --dearmor | sudo tee /usr/share/keyrings/NexusSfan.pgp > /dev/null
+sudo chmod a+r /usr/share/keyrings/NexusSfan.pgp
+
+cat <<EOF | sudo tee /etc/apt/sources.list.d/xlibre-debian.sources
+Types: deb
+URIs: https://xlibre-debian.github.io/devuan/
+Suites: main
+Components: stable
+Signed-By: /usr/share/keyrings/NexusSfan.pgp
+EOF
+
+sudo apt-get update
+sudo apt-get install xlibre xlibre-archive-keyring
+```
+
+If you are using Devuan Testing (Freia) then use `Components: testing`
+
+If you wish to uninstall XLibre and return to Xorg:
+```sh
+sudo apt-get update
+sudo apt-get remove xlibre xserver-xlibre* nexussfan-archive-keyring
+sudo apt-get install xorg
+sudo rm -f /etc/apt/sources.list.d/xlibre-debian.sources
+```