Add rest API description fo marketplace

Signed-off-by: Bartosz Gardziejewski <bartosz.gardziejewski@nokia.com>
Change-Id: I5c43bfc5545a466118cd6427a9aa9d3a02b2c90c
Issue-ID: VNFSDK-700
diff --git a/docs/index.rst b/docs/index.rst
index c5aa92e..c6286d5 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -29,7 +29,7 @@
    files/*Bundling*
    files/VNFSDK-Marketplace-userguide-operators
    files/VNFSDK-Marketplace-userguide-vendors
+   files/VNFSDK-Marketplace-userguide-rest-api.rst
    files/Dovetail
    files/VNFSDK-LFN-CVC
    files/VNFSDK-Marketplace-userguide-installation
-   
\ No newline at end of file