doc: add install section to the readme

README.md

@@ -58,6 +58,26 @@ For more information, see the help.
 vnetod --help
 ```
 
+# Install
+
+## Cargo
+
+```sh
+cargo install vnetod
+```
+
+## Docker
+
+```sh
+docker run --rm -it -v $PWD:/data pleshevskiy/vnetod --help
+```
+
+## Nix
+
+```sh
+nix run git+https://git.pleshevski.ru/pleshevskiy/vnetod -- --help
+```
+
 # License
 
 GNU General Public License v3.0 or later