Add: core submodule and implement new gradle configuration structure

app/.gitignore

@@ -1 +1 @@
-/build
+/build

app/build.gradle

@@ -1,12 +1,11 @@
-apply from: '../versions.gradle'
-
 plugins {
   id 'com.android.application'
   id 'kotlin-android'
-  id 'kotlin-android-extensions'
   id 'kotlin-kapt'
 }
 
+apply from: '../versions.gradle'
+
 android {
   compileSdkVersion build_versions.target_sdk
   buildToolsVersion build_versions.build_tools
@@ -55,11 +54,5 @@ android {
 }
 
 dependencies {
-  implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
-  implementation 'androidx.core:core-ktx:1.3.1'
-  implementation 'androidx.appcompat:appcompat:1.2.0'
-  implementation 'com.google.android.material:material:1.3.0'
-  testImplementation 'junit:junit:4.+'
-  androidTestImplementation 'androidx.test.ext:junit:1.1.2'
-  androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+  implementation project(":core")
 }

app/proguard-rules.pro

@@ -18,4 +18,4 @@
 
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
-#-renamesourcefileattribute SourceFile
+#-renamesourcefileattribute SourceFile