首次提交：初始化后端、数据库结构与文档代码

docs/餐饮零售数据中台/有赞接口/0.sdk.txt

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+-对于Java包，更推荐使用Maven工具安装管理。
+参照以下代码示例，更新最新版本，在Maven中直接引用即可，并且请在settings.xml中引入有赞云maven仓库。
+
+     <dependency>  
+         <groupId>com.youzan.cloud</groupId>  
+         <artifactId>open-sdk-core</artifactId>  
+         <version>1.0.28-RELEASE</version>
+     </dependency>
+     
+     <dependency>  
+         <groupId>com.youzan.cloud</groupId>  
+         <artifactId>open-sdk-gen</artifactId>  
+         <version>1.0.22.80701202109281055-RELEASE</version>
+     </dependency>
+
+     <mirrors>
+         <mirror>
+             <id>youzan-nexus-snapshot</id>
+             <name>Maven Repository Mirror running on maven.youzanyun.com</name>
+             <url>http://maven.youzanyun.com/repository/maven-public</url>
+             <mirrorOf>central</mirrorOf>
+         </mirror>
+     </mirrors> 
+     
+     <profiles>
+         <profile>
+             <id>dev</id>
+             <repositories>
+                <repository>
+                    <id>public</id>
+                    <name>public repository</name>
+                    <url>https://maven.youzanyun.com/repository/maven-public/</url>
+                    <releases>
+                        <enabled>true</enabled>
+                    </releases>
+                    <snapshots>
+                        <enabled>true</enabled>
+                    </snapshots>
+                </repository>
+            </repositories>
+            <pluginRepositories>
+                <pluginRepository>
+                    <id>public</id>
+                    <name>public repository</name>
+                    <url>https://maven.youzanyun.com/repository/maven-public/</url>
+                    <releases>
+                        <enabled>true</enabled>
+                    </releases>
+                    <snapshots>
+                        <enabled>true</enabled>
+                    </snapshots>
+                </pluginRepository>
+            </pluginRepositories>
+         </profile>
+     </profiles>
+     <activeProfiles>
+         <activeProfile>dev</activeProfile>
+     </activeProfiles> 
+
+【说明】
+
+-SDK使用的是OkHttp3，已经暴露了对应的配置方法，可自行根据业务进行配置，参考如下示例。
+
+
+         OkHttpClient.Builder builder = new OkHttpClient.Builder().readTimeout(5, TimeUnit.HOURS);  
+         HttpConfig httpConfig = HttpConfig.builder().OkHttpClientBuilder(builder).build();   
+         YouZanClient youZanClient = new DefaultYZClient(httpConfig);
+-Java open SDK依赖包引入示例如下。
+
+        <dependency>
+              <groupId>com.alibaba</groupId>
+              <artifactId>fastjson</artifactId>
+              <version>1.2.54</version>
+           </dependency>
+           <dependency>
+              <groupId>org.apache.commons</groupId>
+              <artifactId>commons-lang3</artifactId>
+              <version>3.4</version>
+          </dependency>
+           <dependency>
+              <groupId>com.squareup.okhttp3</groupId>
+              <artifactId>okhttp</artifactId>
+              <version>3.12.0</version>
+          </dependency>
+          <dependency>
+              <groupId>com.google.guava</groupId>
+              <artifactId>guava</artifactId>
+              <version>27.0.1-jre</version>
+          </dependency>
+         <dependency>
+              <groupId>commons-codec</groupId>
+              <artifactId>commons-codec</artifactId>
+              <version>1.12</version>
+        </dependency>
+         <dependency>
+              <groupId>com.squareup.okio</groupId>
+              <artifactId>okio</artifactId>
+              <version>1.15.0</version>
+            </dependency>