add j2me-loader

This will add j2me loader to fdroid. @nikita36078 made all the necessary preperations to get this app running here. However since this is a jave ME runtime environment fdroid mourns about a found DexClassLoader when trying to build it.

$ fdroid build ru.playsoftware.j2meloader
INFO: Using git version 2.7.4
INFO: Building version 1.2.7.7 (29) of ru.playsoftware.j2meloader
INFO: Getting source for revision 1.2.7.7
INFO: Creating local.properties file at build/ru.playsoftware.j2meloader/local.properties
INFO: Creating local.properties file at build/ru.playsoftware.j2meloader/app/local.properties
INFO: Cleaning Gradle project...
INFO: Scanning source for common problems...
INFO: Removing gradle-wrapper.jar at gradle/wrapper/gradle-wrapper.jar
ERROR: Found DexClassLoader at app/src/main/java/javax/microedition/shell/MyClassLoader.java
ERROR: Could not build app ru.playsoftware.j2meloader: Kann nicht erstellt werden, da 1 Fehler beim Prüfen aufgetreten ist.
INFO: Build for app ru.playsoftware.j2meloader failed:
Kann nicht erstellt werden, da 1 Fehler beim Prüfen aufgetreten ist.
INFO: Fertiggestellt
INFO: 1 Build fehlgeschlagen