update compile doc

.gitignore

@@ -29,3 +29,5 @@ __pycache__/
 # Doxygen
 doc/html
 doc/latex
+ledger
+build

README.md

@@ -13,11 +13,16 @@ Current Features:
 
 ## Prerequisites
 
-Be sure to have your environment correctly set up (see [Getting Started](https://developers.ledger.com/docs/nano-app/introduction/)) and [ledgerblue](https://pypi.org/project/ledgerblue/) installed.
+Be sure to have your environment correctly set up (see [Getting Started](https://developers.ledger.com/docs/device-app/getting-started)) and [ledgerblue](https://pypi.org/project/ledgerblue/) installed.
 
 ## Compilation
 
-```
+Developers can use the official Ledger Docker image + VS Code Ledger Dev Tool extension to compile, as detailed in the [official documentation](https://developers.ledger.com/docs/device-app/beginner/vscode-extension).
+
+Or set up the compilation environment manually. This method requires downloading the [Ledger SDK](https://github.com/LedgerHQ/ledger-secure-sdk) and then executing the following commands:
+
+```sh
+# Set BOLOS_SDK environment variable to the path of the SDK
 make DEBUG=1  # compile optionally with PRINTF
 make load     # load the app on the Nano using ledgerblue
 ```
@@ -26,7 +31,7 @@ make load     # load the app on the Nano using ledgerblue
 
 High level documentation such as [APDU](doc/APDU.md), and [commands](doc/COMMANDS.md) are included in the developer documentation which can be generated with [doxygen](https://www.doxygen.nl)
 
-```
+```sh
 doxygen .doxygen/Doxyfile
 ```