Added actual doc file

docs/sources/commandline/command/search.rst

@@ -0,0 +1,10 @@
+===================================================================
+``search`` -- Search for an image in the docker index
+===================================================================
+
+::
+
+    Usage: docker search TERM
+
+    Searches for the TERM parameter on the Docker index and prints out a list of repositories
+    that match.