[android] added project.properties file

Makefile.am

@@ -20,6 +20,7 @@ EXTRA_DIST = \
     android/Application.mk \
     android/README \
     android/project/src/com/max2idea/android/fwknop/Fwknop.java \
+    android/project/project.properties \
     android/project/build.xml \
     android/project/custom_rules.xml \
     android/project/res/values/strings.xml \

android/project/project.properties

@@ -0,0 +1,14 @@
+# This file is automatically generated by Android Tools.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file must be checked in Version Control Systems.
+#
+# To customize properties used by the Ant build system edit
+# "ant.properties", and override values to adapt the script to your
+# project structure.
+#
+# To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home):
+#proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
+
+# Project target.
+target=android-19