Document gradle properties for android config

Author: tobil4sk

_docs/project-files/xml-format/config.md

@@ -94,6 +94,20 @@ Use the following syntax to set [`<application />`](https://developer.android.co
 </config:android>
 ```
 
+A similar syntax is also available for setting [gradle properties](https://docs.gradle.org/current/userguide/build_environment.html#the_gradle_properties_file).
+
+```xml
+<config:android>
+	<!-- <https://docs.gradle.org/current/userguide/config_gradle.html#sec:configuring_jvm_memory> -->
+	<gradle-properties org.gradle.jvmargs='-Xmx512m "-XX:MaxMetaspaceSize=384m"' />
+
+	<!-- More verbose option to avoid escaping quotes -->
+	<gradle-properties>
+		<org.gradle.project.myProperty>hello "world"</org.gradle.project.myProperty>
+	</gradle-properties>
+</config:android>
+```
+
 ### HTML5
 
 The following options are available for [HTML5](../../../advanced-setup/html5/) only.