Updated the README.md file with useful commands to clone the project, as well...

Updated the README.md file with useful commands to clone the project, as well as the sub-modules. Updated the scalp_firmware project.

README.md

@@ -14,3 +14,10 @@ The Git repository **scalp_project** corresponds to the root of the Scalp projec
 |
 +-- scalp\_board     (Wiki & documentation)
 ```
+
+# Clone project and submodules
+
+```
+# git clone ssh://git@ssh.hesge.ch:10572/soma/scalp_project.git
+# git submodule update --init --recursive
+```

scalp_firmware @ 8fc40330

-Subproject commit c519317a1d0cc4cbafb2ee1bc57cbb3c61e7aa87
+Subproject commit 8fc4033083adb05574e459c9d329dc1587541987