semesterprojekt: finalize 1.0 deliverable (run profiles, dungeon room, README)

- pom.xml: exec-maven-plugin run profiles (@run console, @gui Swing)
- rooms.yaml: add dungeon room reachable south of the kitchen
- README.md: project overview, build/run/play instructions
- .gitignore: ignore brainstorming companion dir (.superpowers/)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Semesterprojekt/pom.xml

@@ -97,6 +97,28 @@
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>3.5.2</version>
             </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <version>3.5.0</version>
+                <executions>
+                    <execution>
+                        <id>run</id>
+                        <configuration>
+                            <mainClass>thb.jeanluc.adventure.App</mainClass>
+                        </configuration>
+                    </execution>
+                    <execution>
+                        <id>gui</id>
+                        <configuration>
+                            <mainClass>thb.jeanluc.adventure.AppGui</mainClass>
+                        </configuration>
+                    </execution>
+                </executions>
+                <configuration>
+                    <mainClass>thb.jeanluc.adventure.App</mainClass>
+                </configuration>
+            </plugin>
         </plugins>
     </build>