add sharding-transaction-2pc-spi module.

sharding-transaction/sharding-transaction-2pc/pom.xml

@@ -14,5 +14,6 @@
 
     <modules>
         <module>sharding-transaction-xa</module>
+        <module>sharding-transaction-2pc-spi</module>
     </modules>
 </project>

sharding-transaction/sharding-transaction-2pc/sharding-transaction-2pc-spi/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<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">
+    <parent>
+        <artifactId>sharding-transaction-2pc</artifactId>
+        <groupId>io.shardingsphere</groupId>
+        <version>3.0.1-SNAPSHOT</version>
+    </parent>
+    <artifactId>sharding-transaction-2pc-spi</artifactId>
+    <name>${project.artifactId}</name>
+    <modelVersion>4.0.0</modelVersion>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.shardingsphere</groupId>
+            <artifactId>sharding-transaction-core</artifactId>
+            <version>${project.parent.version}</version>
+        </dependency>
+    </dependencies>
+
+</project>