Add docker compose file for running chaincodes

The file will build and run the chaincode on the fly.
Also, it will make use of the available files which is
configured by the user as part of execution. This will
help in bringup/bringdown of the chaincode containers.

In addition, it will help in updating the environment
variables on the go.

Signed-off-by: S m, Aruna <arun.s.m.cse@gmail.com>

asset-transfer-basic/chaincode-external/docker-compose-chaincode.yaml

@@ -0,0 +1,32 @@
+version: "3.6"
+
+networks:
+    docker_test:
+        external: true
+
+services:
+    asset-transfer-basic.org1.example.com:
+        build: .
+        container_name: asset-transfer-basic.org1.example.com
+        hostname: asset-transfer-basic.org1.example.com
+        volumes:
+            - ./crypto:/crypto
+        env_file:
+            - chaincode1.env
+        networks:
+            docker_test:
+        expose:
+            - 9999
+
+    asset-transfer-basic.org2.example.com:
+        build: .
+        container_name: asset-transfer-basic.org2.example.com
+        hostname: asset-transfer-basic.org2.example.com
+        volumes:
+            - ./crypto:/crypto
+        env_file:
+            - chaincode2.env
+        networks:
+            docker_test:
+        expose:
+            - 9999