Introduce template option for linux.system.file

Change-Id: Ifb45b2cf72d71caa9c8a63f8e7684fd15b81e450
Implements: jira/CLOUDB-487
Signed-off-by: Gabor Orosz <gabor.orosz@ericsson.com>
diff --git a/README.rst b/README.rst
index cd9d5c2..0a00089 100644
--- a/README.rst
+++ b/README.rst
@@ -467,6 +467,14 @@
             name: /tmp/test.txt
             source: http://example.com/test.txt
 
+    linux:
+      system:
+        file:
+          test2:
+            name: /tmp/test2.txt
+            source: http://example.com/test2.jinja
+            template: jinja
+
 Ensure presence of file by specifying its contents:
 
 .. code-block:: yaml