chore(gitignore): Ignore unwanted Gradle files (INRIA#4166)

.gitignore

@@ -33,4 +33,23 @@ doc/_jekyll/_site/
 *.tmp
 
 # Nodejs
-node_modules/
+node_modules/
+
+### 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
+
+### Gradle Patch ###
+**/build/