docs: update install instructions

Makefile

@@ -1,4 +1,5 @@
 VERSION ?= $(shell git describe --tags --always --dirty=-dev | sed 's/^v//g')
+PREFIX ?= ~/bin
 VENV_BIN = ./.venv/bin
 
 lint:
@@ -17,7 +18,7 @@ env:
 	$(VENV_BIN)/pre-commit install --install-hooks
 
 install:
-	ln -sf $(shell pwd)/src/viv.py ~/bin/viv
+	ln -sf $(shell pwd)/src/viv.py $(PREFIX)/viv
 
 uninstall:
 	rm ~/bin/viv

README.md

@@ -1,6 +1,16 @@
 # Viv isn't venv
 
 ## Setup
+
+Start by cloning the repo and symlinking the script for access to the CLI.
+By default it will symlink `./src/viv.py` to `~/bin/viv`.
+You can set `PREFIX` to symlink to a different location.
+
+```sh
+git clone git@github.com:daylinmorgan/viv.git ~/.viv
+make install # or PREFIX=~/.local/bin make install
+```
+
 Place this directory on the python path in your rc file.
 
 ```sh