Add QueryDsl auto configuration

Author: backpaper0

doma-spring-boot-autoconfigure/src/main/java/org/seasar/doma/boot/autoconfigure/DomaAutoConfiguration.java

@@ -16,6 +16,7 @@
 import org.seasar.doma.jdbc.SqlFileRepository;
 import org.seasar.doma.jdbc.criteria.Entityql;
 import org.seasar.doma.jdbc.criteria.NativeSql;
+import org.seasar.doma.jdbc.criteria.QueryDsl;
 import org.seasar.doma.jdbc.dialect.Db2Dialect;
 import org.seasar.doma.jdbc.dialect.Dialect;
 import org.seasar.doma.jdbc.dialect.H2Dialect;
@@ -189,4 +190,15 @@ public NativeSql nativeSql(Config config) {
 			return new NativeSql(config);
 		}
 	}
+
+	@Configuration
+	@ConditionalOnClass({ QueryDsl.class })
+	public static class QueryDslConfiguration {
+
+		@Bean
+		@ConditionalOnMissingBean(QueryDsl.class)
+		public QueryDsl queryDsl(Config config) {
+			return new QueryDsl(config);
+		}
+	}
 }