some doc on how to install from source

README.md

@@ -60,6 +60,30 @@ initialized with useful categories and saved views. To explore a populated file:
 cargo run -- demo.agnd --demo
 ```
 
+### Install for use from any directory
+
+From the Rogue Agenda source directory, install the release binary under your
+user-local prefix:
+
+```sh
+cargo install --path . --root "$HOME/.local"
+```
+
+This places the executable at `~/.local/bin/rogue-agenda`. Ensure
+`~/.local/bin` is on your shell's `PATH`; for Bash or Zsh, add this line to the
+appropriate startup file (`~/.bashrc` or `~/.zshrc`) if it is not already there:
+
+```sh
+export PATH="$HOME/.local/bin:$PATH"
+```
+
+After opening a new shell, Rogue Agenda can be launched from anywhere:
+
+```sh
+rogue-agenda notes.agnd
+rogue-agenda demo.agnd --demo
+```
+
 Noninteractive transfer commands are also available:
 
 ```sh