Add sonar plugin and github actions file for sonar analysis

Copied from sonarcloud.io setup page with minor adjustments. Adjusted branch to 'dev' and updated versions

app/build.gradle

@@ -1,3 +1,7 @@
+plugins {
+    id "org.sonarqube" version "3.1.1"
+}
+
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
@@ -158,6 +162,14 @@ afterEvaluate {
     preDebugBuild.dependsOn formatKtlint, runCheckstyle, runKtlint
 }
 
+sonarqube {
+    properties {
+        property "sonar.projectKey", "TeamNewPipe_NewPipe"
+        property "sonar.organization", "teamnewpipe"
+        property "sonar.host.url", "https://sonarcloud.io"
+    }
+}
+
 dependencies {
     coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.1'