Marked code in "nutshell" section as Java (#3)

README.md

@@ -28,7 +28,7 @@ Base objects and ground rules for the Exasol database.
 
 ### In a Nutshell
 
-```
+```java
 final Identifier id = ExasolIdentifier.of("THE_SCHEMA"); // validates on construction
 System.out.println("Schema name: " + id + ", quoted: " + id.quote());
 ```
@@ -60,4 +60,4 @@ Running the Virtual Schema requires a Java Runtime version 11 or later.
 | [Maven Failsafe Plugin](https://maven.apache.org/surefire/maven-surefire-plugin/)   | Integration testing                                    | Apache License 2.0            |
 | [Maven Jacoco Plugin](https://www.eclemma.org/jacoco/trunk/doc/maven.html)          | Code coverage metering                                 | Eclipse Public License 2.0    |
 | [Maven Source Plugin](https://maven.apache.org/plugins/maven-source-plugin/)        | Creating a source code JAR                             | Apache License 2.0            |
-| [Maven Surefire Plugin](https://maven.apache.org/surefire/maven-surefire-plugin/)   | Unit testing                                           | Apache License 2.0            |
+| [Maven Surefire Plugin](https://maven.apache.org/surefire/maven-surefire-plugin/)   | Unit testing                                           | Apache License 2.0            |