adding volume to docker

docker/docker_run.sh

@@ -0,0 +1,7 @@
+# Build the docker file 
+docker build -t digits:v1 -f ./docker/Dockerfile .
+# Create out volume
+docker volume create mltrain
+# Mount our volume to models directory (where train data is stored)
+docker run -v mltrain:/digits/models digits:v1
+