Add few customized functionality

• update ducumentation
• add croutons hide functionality
• add custom layout set functionality
• code improvements
• fix bugs
• bumped target SDK version to 30
• bumped buildToolsVersion to 30.0.2
• bumped RxJava to v. 2.2.19
• bumped Reactivenetwork to v. 3.0.8
• bumped Gradle Build Tools to v. 6.1.1

Proguard rules added and min sdk set to 11

v1.0.3-release

Update README.md

User manual and example code added.

    Initial behaviour for Network status view shows into top of any layouts.
    *  STEP 1: KNetwork.initialize(this) - must declare this into Application.
    *  STEP 2: KNetwork.bind(this, lifecycle) - bind the targeted activity in which you want to show network 
        status.
    *
    *
    *  Available additinal features:
    *
    *  showKNDialog() - set true for show dialog when net connection goes off.
    *  setConnectivityListener() - connected, disconnected callback into activity
    *  setInAnimation() - custom animation setup
    *  setOutAnimation() - custom animation setup
    *  setViewGroupResId() - targeted viewgroup to show network status views.