add copyright to POM file

Signed-off-by: Mohamed Sylla <[email protected]>

Author: syllamoh

sct-data-postgres/pom.xml

@@ -1,4 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!-- SPDX-FileCopyrightText: 2020 RTE FRANCE -->
+<!-- -->
+<!-- SPDX-License-Identifier: Apache-2.0 -->
 <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">