Update getting_started document for docker (#1267)

Docker build for _nncc_ use multistage-build
However multistage-build require docker 17.05 or higher version
This commit will update this information

Signed-off-by: Seok NamKoong <sk.namkoong@samsung.com>

diff --git a/doc/getting_started.md b/doc/getting_started.md
index 685f5af..dc6456e 100644 (file)
--- a/doc/getting_started.md
+++ b/doc/getting_started.md
@@ -6,6 +6,9 @@ The following toolchains are needed to build _nncc_ project:
 
 #### How to build _nncc_ with docker
 
+To build _nncc_ with docker, docker version should be equal or higher than 17.05
+(Reference Docs : [docker site](https://docs.docker.com/develop/develop-images/multistage-build/))
+
 _nncc_ provides ``Dockerfile`` in order to make it easy to setup development environment.
 
 One may build ``nncc`` docker image with the following command: