Add checkstyle plugin

src/Common/build.gradle

@@ -11,6 +11,7 @@ apply plugin: 'java'
 apply plugin: 'eclipse'
 apply plugin: 'idea'
 apply plugin: 'jacoco'
+apply plugin: 'checkstyle'
 
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
@@ -19,6 +20,22 @@ repositories {
     mavenCentral()
 }
 
+def configDir = "${project.rootDir}/quality"
+
+checkstyle {
+    toolVersion '7.8.1'
+    configFile file("$configDir/checkstyle/checkstyle.xml")
+    configProperties.checkstyleSuppressionsPath = file("$configDir/checkstyle/suppressions.xml").absolutePath
+}
+
+checkstyleMain {
+    source ='src/main/java'
+}
+
+checkstyleTest {
+    source ='src/test/java'
+}
+
 dependencies {
     testCompile("junit:junit")
     testCompile(