docs: document libraries

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diff --git a/docs/libraries/battery.md b/docs/libraries/battery.md
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 # Battery
+
+Library and CLI tool for monitoring [upowerd](https://upower.freedesktop.org/) devices.
+
+## Installation
+
+1. install dependencies
+
+:::code-group
+
+```sh [<i class="devicon-archlinux-plain"></i> Arch]
+sudo pacman -Syu meson vala gobject-introspection
+```
+
+```sh [<i class="devicon-fedora-plain"></i> Fedora]
+sudo dnf install meson gcc valac gobject-introspection-devel
+```
+
+```sh [<i class="devicon-ubuntu-plain"></i> Ubuntu]
+sudo apt install meson valac gobject-introspection
+```
+
+:::
+
+::: info
+Although UPower is not a direct build dependency,
+it should be self-explanatory that the daemon is required to be available at runtime.
+:::
+
+2. clone repo
+
+```sh
+git clone https://github.com/aylur/astal.git
+cd astal/lib/battery
+```
+
+3. install
+
+```sh
+meson setup build
+meson install -C build
+```
+
+:::tip
+Most distros recommend manual installs in `/usr/local`,
+which is what `meson` defaults to. If you want to install to `/usr`
+instead which most package managers do, set the `prefix` option:
+
+```sh
+meson setup --prefix /usr build
+```
+
+:::
+
+## Usage
+
+You can browse the [Battery reference](https://aylur.github.io/libastal/battery).
+
+### CLI
+
+```sh
+astal-battery --help
+```
+
+### Library
+
+:::code-group
+
+```js [<i class="devicon-javascript-plain"></i> JavaScript]
+import Battery from "gi://AstalBattery";
+
+const battery = Battery.get_default()
+
+console.log(battery.percentage)
+```
+
+```py [<i class="devicon-python-plain"></i> Python]
+# Not yet documented
+```
+
+```lua [<i class="devicon-lua-plain"></i> Lua]
+-- Not yet documented
+```
+
+```vala [<i class="devicon-vala-plain"></i> Vala]
+// Not yet documented
+```
+
+:::