Initial snapshot - OpenTelemetry demo 2.1.3 -f

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+# Currency Service
+
+The Currency Service does the conversion from one currency to another.
+It is a C++ based service.
+
+## Building docker image
+
+To build the currency service, run the following from root directory
+of opentelemetry-demo
+
+```sh
+docker compose build currency
+```
+
+## Run the service
+
+Execute the below command to run the service.
+
+```sh
+docker compose up currency
+```
+
+## Run the client
+
+currencyclient is a sample client which sends some request to currency
+service. To run the client, execute the below command.
+
+```sh
+docker exec -it <container_name> currencyclient 7000
+```
+
+`7000` is port where currency listens to.