docs: update README with installation instructions for all platforms

Author: timvw

README.md

@@ -25,14 +25,40 @@ Inspired by [haacked/dotfiles/tree-me](https://github.com/haacked/dotfiles/blob/
 ### Homebrew (macOS and Linux)
 
 ```bash
-brew tap timvw/tap
-brew install wt
+brew install timvw/tap/wt
+wt init  # Configure shell integration
 ```
 
+### Scoop (Windows)
+
+```powershell
+scoop bucket add timvw https://github.com/timvw/scoop-bucket
+scoop install wt
+wt init  # Configure shell integration
+```
+
+### Linux Packages
+
+Download `.deb`, `.rpm`, or `.pkg.tar.zst` packages from the [releases page](https://github.com/timvw/wt/releases).
+
+```bash
+# Debian/Ubuntu
+sudo dpkg -i wt_*.deb
+
+# Fedora/RHEL
+sudo rpm -i wt_*.rpm
+
+# Arch Linux (AUR)
+yay -S wt-bin
+```
+
+Shell integration is automatically configured during package installation.
+
 ### From Source
 
 ```bash
 go install github.com/timvw/wt@latest
+wt init  # Configure shell integration
 ```
 
 Or clone and build:
@@ -50,22 +76,41 @@ just install-user     # installs to ~/bin (no sudo)
 mkdir -p bin
 go build -o bin/wt .
 sudo cp bin/wt /usr/local/bin/
+
+# Configure shell integration
+wt init
 ```
 
-### Shell Integration (Optional but Recommended)
+### Shell Integration
 
-Add this to the **END** of your `~/.bashrc` or `~/.zshrc`:
+The `wt init` command automatically configures shell integration for your shell:
 
 ```bash
-source <(wt shellenv)
+wt init              # Auto-detect shell and configure
+wt init bash         # Configure for bash specifically
+wt init zsh          # Configure for zsh specifically
+wt init --dry-run    # Preview changes without modifying files
+wt init --uninstall  # Remove wt configuration from shell
 ```
 
-**Note for zsh users:** Place this after `compinit` in your config file.
+After running `wt init`, restart your shell or run:
+```bash
+source ~/.bashrc   # for bash
+source ~/.zshrc    # for zsh
+```
 
-This enables:
+Shell integration enables:
 - Automatic `cd` to worktree after `checkout`/`create`/`pr`/`mr` commands
 - Tab completion for commands and branch names
 
+**Manual setup** (alternative to `wt init`): Add this to the **END** of your shell config:
+
+```bash
+eval "$(wt shellenv)"
+```
+
+**Note for zsh users:** Place this after `compinit` in your config file.
+
 ## Usage
 
 ### Commands
@@ -102,7 +147,11 @@ wt rm                             # interactive: select from existing worktrees
 # Clean up stale worktree administrative files
 wt prune
 
-# Show shell integration code
+# Configure shell integration
+wt init
+wt init --uninstall   # Remove shell integration
+
+# Show shell integration code (for manual setup)
 wt shellenv
 
 # Show version