Update README

README.md

@@ -11,6 +11,35 @@ This is a native compiled binary, so it runs much faster and doesn't require ext
 # What is this?
 This is a script for hooking mpv and [ff2mpv](https://github.com/woodruffw/ff2mpv), that allows opening any video link in mpv straight from the browser.
 
+# Installation
+First, install ff2mpv extension from [AMO](https://addons.mozilla.org/en-US/firefox/addon/ff2mpv) or [Chrome Store](https://chrome.google.com/webstore/detail/ff2mpv/ephjcajbkgplkjmelpglennepbpmdpjg).
+
+After that get native messasing host manifest:
+```
+ff2mpv-rust manifest
+```
+Install it following manual installation instructions on [ff2mpv wiki](https://github.com/woodruffw/ff2mpv/wiki).
+
+# Configuration
+On Linux configuration file is searched in such order:
+
+1. $XDG_CONFIG_HOME/ff2mpv-rust.json
+2. $HOME/.config/ff2mpv-rust.json
+3. /etc/ff2mpv-rust.json
+
+On Windows configuration file should be placed at: %APPDATA%/ff2mpv-rust.json.
+
+See [example configuration](ff2mpv-rust.json).
+
+# Command line interface
+ff2mpv-rust provides command line interface with following commands:
+```
+help: prints help message
+manifest: prints manifest for browser configuration
+validate: checks configration file for validity
+```
+Note that it won't fail on invalid commands, but instead assume it is called from browser, blocking the input.
+
 # Contributing
 
 All issues and pull requests are welcome! Feel free to open an issue if you've got an idea or a problem. You can open a pull request if you are able to implement it yourself.