Install Melos as global package as part of just init

Update README accordingly
 - Remove Melos from prerequisites

lib/bindings/bindings-flutter/README.md

@@ -2,17 +2,13 @@
 
 Binding generation & build scripts for Dart/Flutter packages of Breez Liquid SDK.
 
-Prerequisites:
-- [just](https://github.com/casey/just) command runner.
-- [Melos](https://github.com/invertase/melos) CLI tool.
+## Prerequisites
+- [just](https://github.com/casey/just?tab=readme-ov-file#installation) command runner.
 
-```
-just clean
-just init
-just gen
-just build
-just link
-``` 
+## Getting Started
+Run `just bootstrap` to initialize your workspace.
+
+To see all available recipes, run `just`.
 
 ## License
 

lib/bindings/bindings-flutter/justfile

@@ -75,6 +75,7 @@ link:
 
 # (melos) use instead of flutter pub get
 init *args:
+	dart pub global activate melos
 	melos bootstrap {{args}}
 
 # (melos) Generate docs for packages in workspace