Add File not found error handling logging

[Jeasmine]

• Add logs for failing steps
• Add successful message

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This change is 

[iAmWillShepherd]

• Changes made to the project and app build.gradle file.
  • gradlePluginPortal() added as repository provider
  • classpath "gradle.plugin.com.onesignal:onesignal-gradle-plugin:[0.12.9, 0.99.99]" dependency added
  • implementation 'com.onesignal:OneSignal:[4.0.0, 4.99.99]' dependency added
  • plugin id 'com.onesignal.androidsdk.onesignal-gradle-plugin' added

The following changes were made to build.gradle

Additionally, state the change first, e.g.

• Added plugin 'com.onesignal.androidsdk.onesignal-gradle-plugin'
• Added dependency 'com.onesignal:OneSignal:[4.0.0, 4.99.99]'
• etc

[adamschlesinger]

I think I would like to see the args documented like so:

Argument	Description	Options
type	Required. Type of SDK to install.	*
target	Name of the App target to install in. Defaults to the entrypoint name. iOS only.	*
path	Path to the project directory. Defaults to the current directory.	*
entrypoint	iOS - Name of the target XCProject Android - Application class file directory For the CLI to create the file for you, you will need to provide the directory inside the project and file name with the extension where you want the Application file to be created. Example: app/src/main/java/com/onesignal/testapplication/BaseApp.java	*
lang	Programming language to use.	objc, swift, java, kotlin
appid	OneSignal App Id. Not yet used for iOS installs.	*

And as far as using the CLI I don't see a large distinction right now between args and options and I would really like to be able to invoke it as:

onesignal install-sdk 
    --type android
    --path ../MyAppDir 
    --entrypoint app/src/main/java/com/onesignal/testapplication/BaseApp.java 
    --lang java 
    --appid 1234567890