Add the doc directory for tosca parsers

Issue-ID: MODELING-31

Change-Id: Ia089f54cfaafac1a1b7fd39fe0b773a8b50f8ae0
Signed-off-by: denghui02 <denghui12@huawei.com>
diff --git a/.gitmodules b/.gitmodules
index d498ac1..a327b32 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -313,3 +313,6 @@
 	url = ../logging-analytics
 	branch = .
 	ignore = dirty
+[submodule "docs/submodules/modeling/toscaparsers.git"]
+	path = docs/submodules/modeling/toscaparsers.git
+	url = ../modeling/toscaparsers