Add Skywalking Sample

skywalking/README.md

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+# Tutorial
+
+1. in Skywalking folder, run `docker-compose up -d` to start all skywalking needed services. (in this sample, we use elastic-search as backend service)
+2. when start business service use below command
+`java -jar -javaagent:$AGENT_PATH/skywalking-agent.jar -Dskywalking.agent.service_name=dubbo-rating -Dskywalking.collector.servers=localhost:10800 rating.jar`

skywalking/docker-compose.yml

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+# 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
+#
+#     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.
+
+version: '3.3'
+services:
+  elasticsearch:
+    image: docker.elastic.co/elasticsearch/elasticsearch:7.5.0
+    container_name: elasticsearch
+    restart: always
+    ports:
+      - 9200:9200
+    environment:
+      - discovery.type=single-node
+      - bootstrap.memory_lock=true
+      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
+    ulimits:
+      memlock:
+        soft: -1
+        hard: -1
+  oap:
+    image: apache/skywalking-oap-server:7.0.0-es7
+    container_name: oap
+    depends_on:
+      - elasticsearch
+    links:
+      - elasticsearch
+    restart: always
+    ports:
+      - 11800:11800
+      - 12800:12800
+    environment:
+      SW_STORAGE: elasticsearch7
+      SW_STORAGE_ES_CLUSTER_NODES: elasticsearch:9200
+  ui:
+    image: apache/skywalking-ui:7.0.0
+    container_name: ui
+    depends_on:
+      - oap
+    links:
+      - oap
+    restart: always
+    ports:
+      - 8090:8080
+    environment:
+      SW_OAP_ADDRESS: oap:12800