update README with AUR info

PKGBUILD

@@ -0,0 +1,31 @@
+# Maintainer: <szymon_jozef@proton.me>
+_pkgname="zutui"
+pkgname="$_pkgname-git"
+pkgver=1.0.0
+pkgrel=1
+pkgdesc="TUI for accessing edziekanat of ZUT university"
+arch=("any")
+url="https://github.com/shv187/zutui"
+license=("MIT")
+depends=("python" "python-keyring" "python-textual")
+makedepends=("git" "python-build" "python-installer" "python-wheel" "python-setuptools")
+provides=("zutui")
+conflicts=("zutui")
+source=("$_pkgname::git+${url}.git")
+sha256sums=("SKIP")
+
+pkgver() {
+    cd "$_pkgname"
+    printf "r%s.%s" "$(git rev-list --count HEAD)" "$(git rev-parse --short HEAD)"
+}
+
+build() {
+	cd "$_pkgname"
+    python -m build --wheel --no-isolation
+}
+
+package() {
+	cd "$_pkgname"
+    python -m installer --destdir="$pkgdir" dist/*.whl
+    install -Dm644 LICENSE "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
+}

README.md

@@ -10,15 +10,31 @@
 <img width="100%" height="auto" alt="Grades Page" src="https://github.com/user-attachments/assets/6536c74d-13a5-436e-af3d-5522216ce8c1" />
 
 # Usage
-### 1. Download:
+## 1. Download:
+### On Windows:
 ```
 pip install git+https://github.com/shv187/zutui.git
 ```
-### 2. Start:
+### Arch Linux:
+You can use PKGBUILD. Just run:
+```bash
+makepkg -si
+```
+or if you want to, you can use AUR helper of your choice. For example:
+```bash
+yay -S zutui-git
+```
+### MacOs and other Linux distros:
+Most distros environments are externally managed by the system package manager, so the most straightforward way would be using something like `pipx`.
+```bash
+pipx install git+https://github.com/shv187/zutui.git
+```
+
+## 2. Start:
 ```
 zutui
 ```
-### 3. Enjoy :)
+## 3. Enjoy :)
 
 # Bindings
 `j` - Down