update readme

Author: binarynoise

Readme.md

@@ -1,17 +1,35 @@
 # open in mpv
 
+A minimalist extension to open the current website or a link in mpv.
+You only need to put a .desktop file to `~/.local/share/applications/mpv-scheme-handler.desktop`.
+
+And if you don't have that file installed, you get a shell-script to put it into place.
+No more "nothing happens" and no-one knows why!
+
+Inspired by _Open In mpv_ by Leonardo and _ff2mpv_ by yossarian, which require additional binaries installed but don't tell you when they are missing.
+
 ## License
 
 Licensed under the EUPL-1.2-or-later
 
-## installation guide (Firefox):
-1. TODO
-
-## installation guide (Chromium):
-1. download it & unzip the downloaded file or clone the repo
-2. open chromium on your pc
-3. go to chrome://extensions/
-4. enable developer mode
-42. click load unpacked
-55. replace manifest.json by manifest-chrome.json
-69. select the folder with the plugin data
+## Installation
+
+### Firefox
+
+Go to !release pending! and install the extension
+
+## Local (development) installation
+
+### Firefox
+
+1. go to <about:debugging#/runtime/this-firefox>
+2. click "load temporary add-on"
+3. select the `manifest.json`.
+
+### Chromium:
+
+1. replace `manifest.json` with `manifest-chrome.json`
+2. go to <chrome://extensions/>
+3. enable developer mode
+4. click "load unpacked"
+5. select the folder containing this extension.