Added original source files

Added original source files from LibreTrivia

app/build.gradle

@@ -0,0 +1,56 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 28
+    buildToolsVersion '28.0.3'
+
+    defaultConfig {
+        applicationId "io.github.trytonvanmeer.libretrivia"
+        minSdkVersion 19
+        targetSdkVersion 28
+        versionCode 3
+        versionName "0.3"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    compileOptions {
+        encoding = 'UTF-8'
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+ext {
+    butterknife = '9.0.0-rc2'
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+
+    implementation 'androidx.annotation:annotation:1.0.0'
+    implementation 'androidx.appcompat:appcompat:1.0.2'
+    implementation 'androidx.cardview:cardview:1.0.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha2'
+    implementation 'androidx.legacy:legacy-preference-v14:1.0.0'
+    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
+    implementation 'androidx.recyclerview:recyclerview:1.0.0'
+
+    implementation "com.jakewharton:butterknife:${butterknife}"
+    annotationProcessor "com.jakewharton:butterknife-compiler:${butterknife}"
+
+    implementation 'com.google.code.gson:gson:2.8.5'
+    implementation 'com.mikepenz:aboutlibraries:6.2.0'
+
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.3.2'
+    androidTestImplementation 'org.junit.jupiter:junit-jupiter-api:5.3.2'
+    androidTestImplementation 'androidx.test:core:1.0.0'
+    androidTestImplementation 'androidx.test:runner:1.1.0'
+    androidTestImplementation 'androidx.test.ext:junit:1.0.0'
+}