added new build script

.gitattributes

+.git* export-ignore
\ No newline at end of file

.gitlab-ci.yml

+include:
+  - project: 'moodle_l2p/moodle-ci'
+    file: '/build-package.gitlab-ci.yml'
+
+variables:
+  PACKAGE_NAME:         moodle-rwth-pdfannotator
+  PACKAGE_CAPABILITIES: moodle-rwth-rwth_pdfannotator
+  PACKAGE_SUMMARY:      RWTH plugin that allows students to make annotations and ask questions via comments regarding PDFs provided by teachers.
+  PACKAGE_DESCRIPTION:  Package to install the Moodle Plugin pdfannotator.