feat: Add document scanner package

packages/paperless_document_scanner/android/build.gradle

@@ -0,0 +1,68 @@
+group 'de.astubenbord.paperless_document_scanner'
+version '1.0-SNAPSHOT'
+
+buildscript {
+    ext.kotlin_version = '1.7.10'
+    repositories {
+        google()
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:7.2.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+
+android {
+    compileSdkVersion 31
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+        main {
+            jniLibs.srcDirs = ['jniLibs']
+        }
+    }
+
+    defaultConfig {
+        minSdkVersion 21
+    }
+
+    lintOptions {
+        disable 'InvalidPackage'
+    }
+
+    externalNativeBuild {
+        cmake {
+            path "CMakeLists.txt"
+        }
+    }
+
+    defaultConfig {
+        externalNativeBuild {
+            cmake {
+                cppFlags '-frtti -fexceptions -std=c++11'
+                arguments "-DANDROID_STL=c++_shared"
+            }
+        }
+    }
+}