add startup message with version number

startup-message.ts

@@ -0,0 +1,19 @@
+import PACKAGE_JSON from './package.json';
+import { BuildConfig } from './src/config/build-config.interface';
+
+/**
+ * Log a message at the start of the application containing the version number and the environment.
+ *
+ * @param environment   the environment configuration
+ */
+export const logStartupMessage = (environment: Partial<BuildConfig>) => {
+  const env: string = environment.production ? 'Production' : 'Development';
+  const color: string = environment.production ? 'red' : 'green';
+
+  console.info('');
+  console.info(`%cdspace-angular`, `font-weight: bold;`);
+  console.info(`Version: %c${PACKAGE_JSON.version}`, `font-weight: bold;`);
+  console.info(`Environment: %c${env}`, `color: ${color}; font-weight: bold;`);
+  console.info('');
+
+}