Fix maven build instructions

Maven javafx:run fails because of java 15. This commit also removes some maven stuff, which is not needed anymore

.mvn/jvm.config

@@ -0,0 +1 @@
+--enable-preview

ReadMe.md

@@ -77,7 +77,7 @@ We are almost ready to release a beta once !8 is merged.
 2. Clone this repo (`git clone https://gitlab.bixilon.de/bixilon/minosoft.git`)
 3. Change directory (`cd minosoft`)
 4. Checkout the branch (`git checkout <branch>`). Probably `render`
-5. Run Minosoft with `mvn javafx:run`. If any errors occur, feel free to open an issue. In this early stage it might be helpful
+5. Build and run Minosoft with `mvn clean verify exec:java`. If any errors occur, feel free to open an issue. In this early stage it might be helpful
  to delete the app data folder (only of minosoft).
 
 

pom.xml

@@ -1,4 +1,5 @@
-<?xml version="1.0" encoding="UTF-8"?><!--
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
   ~ Minosoft
   ~ Copyright (C) 2020 Moritz Zwerger
   ~
@@ -29,35 +30,13 @@
                     <compilerArgs>--enable-preview</compilerArgs>
                 </configuration>
             </plugin>
-            <plugin>
-                <groupId>org.openjfx</groupId>
-                <artifactId>javafx-maven-plugin</artifactId>
-                <version>0.0.4</version>
-                <configuration>
-                    <mainClass>de.bixilon.minosoft.Minosoft</mainClass>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-assembly-plugin</artifactId>
-                <version>2.3</version>
-                <configuration>
-                    <archive>
-                        <manifest>
-                            <mainClass>de.bixilon.minosoft.Minosoft</mainClass>
-                        </manifest>
-                    </archive>
-                    <descriptorRefs>
-                        <descriptorRef>jar-with-dependencies</descriptorRef>
-                    </descriptorRefs>
-                </configuration>
-            </plugin>
         </plugins>
     </build>
 
     <properties>
         <maven.compiler.source>15</maven.compiler.source>
         <maven.compiler.target>15</maven.compiler.target>
+        <exec.mainClass>de.bixilon.minosoft.Minosoft</exec.mainClass>
     </properties>
 
     <dependencies>