Add starting build.gradle file

gradle/gradle-fat-jar/build.gradle

@@ -0,0 +1,10 @@
+apply plugin: 'java'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies{
+    compile group: 'org.slf4j', name: 'slf4j-api', version: '1.7.25'
+    compile group: 'org.slf4j', name: 'slf4j-simple', version: '1.7.25'
+}