Add README.md to Linux package (#11859)

platform/linux/do_debian_package.sh

@@ -65,7 +65,7 @@ fi
 mkdir -p tmp-debian/usr
 chmod 0755 tmp-debian/usr
 tar -xf "${1}" -C tmp-debian/usr
-rm -f tmp-debian/usr/koreader.appdata.xml
+rm -f tmp-debian/usr/koreader.appdata.xml tmp-debian/usr/README.md
 ARCH="$(echo "${1}" | cut -d '-' -f3)"
 VERSION="$(cut -f2 -dv "tmp-debian/usr/lib/koreader/git-rev" | cut -f1,2 -d-)"
 DEB_ARCH="$(uname_to_debian "${ARCH}")"

platform/linux/instructions.txt

@@ -0,0 +1,17 @@
+KOReader %%VERSION%% (Linux %%ARCH%%)
+--------
+
+## Requires
+
+- `GLIBC` >= %%ABI%%
+- `SDL2`
+
+## Users
+
+#### You shouldn't use this package unless you know what you're doing. Please use [AppImage](https://github.com/koreader/koreader/wiki/Installation-on-desktop-linux#what-is-an-appimage) instead.
+
+## Package maintainers
+
+The script in **`bin/`** expects the rest of the **assets** in **`../lib/koreader`**.
+
+In any case the aforementioned script should jump to the **assets** dir and call **`./reader.lua`**.