add data folder to dockerfile

Author: wlawt

README.md

@@ -1,4 +1,4 @@
 # transaction-latency
 
 docker build -t transaction-latency .
-docker run -v (pwd)/data:/data --env-file .env --rm -it  transaction-latency
+docker run -v $(pwd)/data:/app/data --env-file .env --rm -it  transaction-latency