sim-applet: start with hello-stk

Import source from here: https://git.osmocom.org/sim/hello-stk
diff --git a/sim-applet/.gitignore b/sim-applet/.gitignore
new file mode 100644
index 0000000..567609b
--- /dev/null
+++ b/sim-applet/.gitignore
@@ -0,0 +1 @@
+build/