Add some example applications

apps/musescore.Dockerfile

@@ -0,0 +1,11 @@
+FROM thomasloven/novnc-base
+
+RUN sudo apt-get update \
+  && DEBIAN_FRONTEND=noninteractive \
+  sudo apt-get install -y software-properties-common \
+  && sudo add-apt-repository -y ppa:mscore-ubuntu/mscore3-stable \
+  && sudo apt-get update \
+  && DEBIAN_FRONTEND=noninteractive \
+  sudo apt-get install -y musescore3
+
+CMD ["musescore3"]