fix(examples): add explanations about docker group to examples/electr…

…icity-trade and examples/cartrade

Signed-off-by: Ryu-Shinzaki <shinzaki.ryu@fujitsu.com>

examples/cartrade/README.md

@@ -29,6 +29,7 @@ Before you begin, you need to check that you have all the prerequisites installe
 	```
 	./script-start-ledgers.sh
 	```
+	- (NOTICE: Before executing the above, your account need to be added to the docker group (`usermod -a -G docker YourAccount` from root user))
 	- If the following containers are started when displaying the container list with the docker ps command, it will be fine.
 		```
 		CONTAINER ID        IMAGE                                                                                                    COMMAND                  CREATED              STATUS              PORTS                                                    NAMES
@@ -102,4 +103,3 @@ Before you begin, you need to check that you have all the prerequisites installe
 1. Stop the docker containers of Ethereum and Fabric
 	- Press the command `docker stop <CONTAINER ID>` to stop the container corresponding to the above containers which were launched by `./script-start-ledgers.sh` on the boot method. If you want to destroy the docker containers, press the command `docker rm <CONTAINER ID>` after the above.
 	- If any other docker containers are not running on your machine, you can destroy the Docker containers only with `docker ps -aq | xargs docker stop` and `docker ps -aq | xargs docker rm`.
-

examples/electricity-trade/README.md

@@ -30,6 +30,7 @@ Before you begin, you need to check that you have all the prerequisites installe
 	```
 	./script-start-ledgers.sh
 	```
+	- (NOTICE: Before executing the above, your account need to be added to the docker group (`usermod -a -G docker YourAccount` from root user))
 	- If the following containers are started when displaying the container list with the docker ps command, it will be fine.
 		```
 		CONTAINER ID        IMAGE                                              COMMAND                  CREATED             STATUS              PORTS                                                    NAMES