Basic gradle build structure

Change-Id: I07a8097955ad77d002663fcc62cc9a1988f2eaf5
diff --git a/buildSrc/src/main/groovy/org/opencord/gradle/rules/DockerTagRule.groovy b/buildSrc/src/main/groovy/org/opencord/gradle/rules/DockerTagRule.groovy
new file mode 100644
index 0000000..474e16d
--- /dev/null
+++ b/buildSrc/src/main/groovy/org/opencord/gradle/rules/DockerTagRule.groovy
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2012 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.opencord.gradle.rules
+
+import org.gradle.api.Rule
+import de.gesellix.gradle.docker.tasks.DockerTagTask
+
+
+/**
+ * Gradle Rule class to tag a docker image
+ */
+class DockerTagRule implements Rule {
+
+    def project
+
+    DockerTagRule(project) {
+        this.project = project
+    }
+
+    String getDescription() {
+        'Rule Usage: tag<component-name>'
+    }
+
+    void apply(String taskName) {
+        if (taskName.startsWith('tag') && !taskName.equals('tag')) {
+            project.task(taskName, type: DockerTagTask) {
+                ext.compName = taskName - 'tag'
+                def spec = project.comps[compName]
+                imageId = spec.name + '@' + spec.digest
+                tag = compName + ':' + project.targetTag
+            }
+        }
+    }
+}