Add DDL test cases 1th.

sharding-jdbc-core/src/test/resources/parser/create.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<asserts>
+    <assert id="assertCreateTable">
+        <tables>
+            <table name="t_temp" />
+        </tables>
+    </assert>
+    <!--// TODO verify SQL-->
+    <!--<assert id="assertCreateTableIfNotExist">-->
+        <!--<tables>-->
+            <!--<table name="t_temp" />-->
+        <!--</tables>-->
+    <!--</assert>-->
+</asserts>

sharding-jdbc-core/src/test/resources/sql/ddl/create.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<sqls>
+    <sql id="assertCreateTable" value="CREATE TABLE t_temp(id int)" />
+    <sql id="assertCreateTableIfNotExist" value="CREATE TABLE IF NOT EXISTS t_temp(id int)" type="PostgreSQL"/>
+    <sql id="assertCreateTemporaryTable" value="CREATE TEMPORARY TABLE IF NOT EXISTS t_temp(id int)" type="H2,MySQL,PostgreSQL"/>
+</sqls>