Initial snapshot - OpenTelemetry demo 2.1.3 -f

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+# Email Service
+
+The Email service "sends" an email to the customer with their order details by
+rendering it as a log message. It expects a JSON payload like:
+
+```json
+{
+  "email": "some.address@website.com",
+  "order": "<serialized order protobuf>"
+}
+```
+
+## Local Build
+
+We use `bundler` to manage dependencies. To get started, simply `bundle install`.
+
+## Running locally
+
+You may run this service locally with `bundle exec ruby email_server.rb`.
+
+## Docker Build
+
+From `src/email`, run `docker build .`