Add the README.

README.md

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+# jdbc-hospital-example
+
+This project is a example of using jdbc
+
+The project uses the [Spock Framework Example Project](https://github.com/spockframework/)
+
+## Prerequisites
+
+- JDK 17 or higher
+
+- Maven use `mvnw` wrapper
+
+- Gradle use `gradlew` wrapper
+
+## Building with Gradle
+
+Downloaded files (including the Gradle distribution itself) will be stored in the Gradle user home directory (typically **user_home**`/.gradle`).
+
+Type: test
+
+```shell
+./gradlew clean test
+```
+
+Type: build
+
+```shell
+./gradlew clean build
+```
+
+Type: preparation
+- create a folder, for example, `project`.
+- copy config/db to the folder.
+- copy `jdbc_hospital_example-1.0.2.jar` from a release to the folder.
+  - if you build the application from source, find the file (`jdbc_hospital_example-1.0.2-all.jar`) in `build/libs/`.
+- copy docker/docker-compose.yml to the folder.
+- turn up the database in the `project/docker`:
+  ```
+  docker-compose up -d
+  ```
+- wait a minute while the database is bootstrapping.
+- now you can connect with the application.
+
+Type: run
+
+After the preparation, run the application in the folder, for example, `project`:
+```shell
+java -jar jdbc_hospital_example-1.0.2.jar
+```
+
+## Building with Maven
+
+Downloaded files will be stored in the local Maven repository (typically **user_home**`/.m2/repository`).
+
+Type: test
+
+```shell
+./mvnw clean test
+```
+
+Type: build
+
+
+```shell
+./mvnw clean package
+```
+
+Type: preparation
+- create a folder, for example, `project`.
+- copy config/db to the folder.
+- copy `jdbc_hospital_example-version.jar` from a release to the folder.
+  - if you build the application from source, find the file in `target/`.
+- copy docker/docker-compose.yml to the folder.
+- turn up the database in the `project/docker`:
+  ```
+  docker-compose up -d
+  ```
+- wait a minute while the database is bootstrapping.
+- now you can connect with the application.
+
+Type: run
+
+After the preparation, run the application in the folder, for example, `project`:
+```shell
+java -jar jdbc_hospital_example-1.0.2.jar
+```
+
+## Author
+
+Kostiantyn Klochko (c) 2023
+