add installation instructions to README.md

README.md

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+## Installation (stow on Linux)
+
+Assuming the repository is already present locally (e.g., at ~/.dotfiles):
+
+1. From the repo root, run:
+```
+cd ~/.dotfiles
+stow .
+```
+- Running `stow .` from the repo root is sufficient; no `--target` is needed.
+- Preview changes with `stow -n .` before applying.
+
+2. Optional — set fish as your login shell:
+```
+chsh -s "$(which fish)" "$USER"
+```
+
+Notes:
+- Resolve any file conflicts before running `stow` (move or remove existing files).
+- This repository is private; manage updates using your preferred method.