updated readme for submodules

README.md

@@ -11,6 +11,8 @@
 ## Debian Build Notes
 
 * `apt-get install ncurses-dev git make g++`
+* `git submodule init`
+* `git submodule update`
 * `make release`
 
 ## Create Standalone with Debian 11
@@ -29,6 +31,11 @@ Instructions how to create a standalone machine that boots directly to reHDD. Th
 
 clone this repo into /root/
 
+```
+git submodule init
+git submodule update
+```
+
 `cd /root/reHDD/`
 
 `make release`