Merge pull request #54 from peterwillcn/master

Supplementary docker operation detailed documentation

Docker/README.md

@@ -9,6 +9,7 @@ Build eos images
 
 ```
 cd eos/Docker
+cp ../genesis.json .
 docker build -t eosio/eos .
 ```
 

README.md

@@ -90,6 +90,7 @@ Build eos images
 
 ```
 cd eos/Docker
+cp ../genesis.json .
 docker build -t eosio/eos .
 ```