Update .gitignore

app/.gitignore

@@ -1,15 +1,8 @@
-/build
-
-# Created by https://www.gitignore.io/api/java
-# Edit at https://www.gitignore.io/?templates=java
+# Created by https://www.gitignore.io/api/java,gradle
 
 ### Java ###
-# Compiled class file
 *.class
 
-# Log file
-*.log
-
 # BlueJ files
 *.ctxt
 
@@ -19,15 +12,26 @@
 # Package Files #
 *.jar
 *.war
-*.nar
 *.ear
-*.zip
-*.tar.gz
-*.rar
-*.gradle
 
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
 
-# End of https://www.gitignore.io/api/java
 
+### Gradle ###
+.gradle
+/build/
+
+# Ignore Gradle GUI config
+gradle-app.setting
+
+# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
+!gradle-wrapper.jar
+
+# Cache of project
+.gradletasknamecache
+
+# # Work around https://youtrack.jetbrains.com/issue/IDEA-116898
+# gradle/wrapper/gradle-wrapper.properties
+
+# End of https://www.gitignore.io/api/java,gradle