docs: Add info on git LFS dependency

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

docs/oniro-quick-build.rst

@@ -45,7 +45,7 @@ by:
 
     $ sudo add-apt-repository ppa:ostc/ppa
     $ sudo apt-get update
-    $ sudo apt-get install git-repo
+    $ sudo apt-get install git-repo git-lfs
 
 Initialize a repo workspace and clone all required repositories:
 

docs/repo-workspace.rst

@@ -89,6 +89,16 @@ On OpenMandriva:
 OpenMandriva has already added |main_project_name| version of ``repo`` to its official
 repositories. If you're on OpenMandriva, simply ``dnf install repo``.
 
+Git LFS
+*******
+
+Some projects included in the repo configuration (manifests) use git LFS which
+means the associated package needs to be installed. Here is an example for
+**Ubuntu**:
+
+.. code-block:: console
+
+    $ sudo apt-get install git-lfs
 
 The Manifests
 *************