runeliteplus: adds preliminary Gradle support

protocol/build.gradle

@@ -0,0 +1,10 @@
+
+description = 'Protocol'
+dependencies {
+  compile project(':protocol-api')
+  compile project(':cache')
+    compile group: 'com.google.guava', name: 'guava', version:'28.0-jre'
+    compile group: 'io.netty', name: 'netty-all', version:'4.1.37.Final'
+    testCompile group: 'junit', name: 'junit', version:'4.12'
+    compileOnly group: 'org.projectlombok', name: 'lombok', version:'1.18.8'
+}