update gitignore

android/.gitignore

 *.iml
 .gradle
 /local.properties
-/.idea/caches
-/.idea/libraries
-/.idea/modules.xml
 /.idea/workspace.xml
-/.idea/navEditor.xml
-/.idea/assetWizardSettings.xml
+/.idea/libraries
 .DS_Store
 /build
 /captures
 .externalNativeBuild
-build.gradle/
-build.gradle
 
-# Built application files
+#built application files
 *.apk
 *.ap_
-*.aab
 
-# Files for the ART/Dalvik VM
+# files for the dex VM
 *.dex
 
 # Java class files
 *.class
 
-# Generated files
+# generated files
 bin/
 gen/
-out/
-
-# Gradle files
-.gradle/
-build/
 
 # Local configuration file (sdk path, etc)
 local.properties
 
-# Proguard folder generated by Eclipse
-proguard/
-
-# Log Files
-*.log
+# Windows thumbnail db
+Thumbs.db
 
-# Android Studio Navigation editor temp files
-.navigation/
-
-# Android Studio captures folder
-captures/
+# OSX files
+.DS_Store
 
-# IntelliJ
+# Android Studio
 *.iml
-.idea/workspace.xml
-.idea/tasks.xml
-.idea/gradle.xml
-.idea/assetWizardSettings.xml
-.idea/dictionaries
-.idea/libraries
-.idea/caches
-# Android Studio 3 in .gitignore file.
-.idea/caches/build_file_checksums.ser
-.idea/modules.xml
-
-# Keystore files
-# Uncomment the following lines if you do not want to check your keystore files in.
-#*.jks
-#*.keystore
-
-# External native build folder generated in Android Studio 2.2 and later
-.externalNativeBuild
-
-# Google Services (e.g. APIs or Firebase)
-# google-services.json
-
-# Freeline
-freeline.py
-freeline/
-freeline_project_description.json
-
-# fastlane
-fastlane/report.xml
-fastlane/Preview.html
-fastlane/screenshots
-fastlane/test_output
-fastlane/readme.md
-
-# Version control
-vcs.xml
+.idea
+#.idea/workspace.xml - remove # and delete .idea if it better suit your needs.
+.gradle
+build/
+.navigation
+captures/
+output.json 
 
-# lint
-lint/intermediates/
-lint/generated/
-lint/outputs/
-lint/tmp/
-# lint/reports/
+#NDK
+obj/
+.externalNativeBuild
\ No newline at end of file

android/app/build.gradle

+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 28
+    defaultConfig {
+        applicationId "com.chatman"
+        minSdkVersion 21
+        targetSdkVersion 28
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'com.android.support:appcompat-v7:28.0.0'
+    implementation 'com.android.support:support-v4:28.0.0'
+    implementation 'com.android.support:design:28.0.0'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+    implementation 'com.google.firebase:firebase-core:16.0.6'
+    implementation 'com.google.firebase:firebase-database:16.0.6'
+    implementation 'com.github.bumptech.glide:glide:4.9.0'
+    annotationProcessor 'com.github.bumptech.glide:compiler:4.9.0'
+}
+
+apply plugin: 'com.google.gms.google-services'

android/build.gradle

+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+    repositories {
+        google()
+        jcenter()
+        
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.3.1'
+        classpath 'com.google.gms:google-services:4.0.1'
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+        mavenCentral()
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}