Add README

README.md

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+# Banking Service REST API
+
+## Development assignment for Backend Developer at Finologee
+
+### What has been implemented
+
+* All the main requirements
+* Payment execution as a single transaction
+* Swagger specification for the REST API
+* Docker build
+
+The application runs on Java 20 using Spring Boot 3.0.6.
+An H2 database is populated on startup. The initial data is described below.
+
+### What has not been implemented
+
+* Pagination
+* Registering fraud tentatives
+
+### How to run the application
+
+The application runs on Java 20, so a JDK should be installed on the build system.
+
+#### Manually
+
+Using Maven, you can run the following command:
+
+```shell
+./mvnw install
+```
+
+This will put an executable JAR in `./target`, which can be run using:
+
+```shell
+java -jar target/*.jar
+```
+
+#### Using Docker
+
+Build the JAR file as before and then execute the following command to extract the layers from the JAR:
+
+```shell
+mkdir target/extracted && java -Djarmode=layertools -jar target/*.jar extract --destination target/extracted
+```
+
+Building the image:
+
+```shell
+docker build -t bankingservice .
+```
+
+Run it using the following command:
+
+```shell
+docker run -p 8080:8080 bankingservice
+```
+
+### Populated data