Created Gradle Overlay How-To (markdown)

Gradle-Overlay-How-To.md

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+If you are using Gradle, it is easy to create an overlay project using standard Gradle means. Here is an example `build.gradle`:
+
+	apply plugin: 'war'
+	
+	repositories {
+		mavenCentral()
+	}
+	
+	configurations {
+		overlay {
+			transitive = false
+		}
+	}
+	
+	dependencies {
+		overlay('org.mitre:openid-connect-server-webapp:1+')
+	}
+	
+	war {
+		duplicatesStrategy = 'exclude'
+		
+		configurations.overlay.filter({it.name.endsWith(".war")}).each {
+			from zipTree(it)
+		}
+	}