add griffin bom for third party dependencies management

griffin-bom/README.md

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+this is for third party dependencies' management.

griffin-bom/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you 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
+
+  https://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.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.apache.griffin</groupId>
+        <artifactId>griffin</artifactId>
+        <version>2.0.0-SNAPSHOT</version>
+        <relativePath/>
+    </parent>
+
+    <groupId>org.apache.griffin</groupId>
+    <artifactId>griffin-bom</artifactId>
+    <version>2.0.0-SNAPSHOT</version>
+    <packaging>pom</packaging>
+    <name>Apache Griffin BOM ${project.version}</name>
+    <url>https://griffin.apache.org</url>
+
+    <properties>
+
+    </properties>
+
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>junit</groupId>
+                <artifactId>junit</artifactId>
+                <version>4.12</version>
+                <scope>test</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+
+
+</project>