Fix NoPropertyFileFoundException crash by adding koin.properties

[aldoKelvianto]

If we run the App from master branch, user will get the following error:

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: koin.sampleapp.mvvm, PID: 21906
    java.lang.RuntimeException: Unable to create application fr.ekito.myweatherapp.MainApplication: org.koin.core.error.NoPropertyFileFoundException: No properties found for file '/koin.properties'
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5500)
        at android.app.ActivityThread.-wrap2(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1584)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:163)
        at android.app.ActivityThread.main(ActivityThread.java:6221)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
     Caused by: org.koin.core.error.NoPropertyFileFoundException: No properties found for file '/koin.properties'
        at org.koin.core.registry.PropertyRegistry.loadPropertiesFromFile(PropertyRegistry.kt:100)
        at org.koin.core.KoinApplication.fileProperties(KoinApplication.kt:84)
        at org.koin.core.KoinApplication.fileProperties$default(KoinApplication.kt:83)
        at fr.ekito.myweatherapp.MainApplication$onCreate$1.invoke(MainApplication.kt:22)
        at fr.ekito.myweatherapp.MainApplication$onCreate$1.invoke(MainApplication.kt:15)
        at org.koin.core.context.GlobalContextKt.startKoin(GlobalContext.kt:72)
        at fr.ekito.myweatherapp.MainApplication.onCreate(MainApplication.kt:21)
        at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1025)
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5497)
        at android.app.ActivityThread.-wrap2(ActivityThread.java) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1584) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:163) 
        at android.app.ActivityThread.main(ActivityThread.java:6221) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)

Thats because fileProperties will use default fileName location that is src/main/resources/koin.properties.

fun fileProperties(fileName: String = "/koin.properties"): KoinApplication {

This PR add koin.properties so the App won't crashed upon launching.

[tw-Frey]

issue #5

use androidFileProperties() instead of fileProperties()
because koin.properties in assets fold