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-ext_token_login
+  PACKAGE_CAPABILITIES: moodle-rwth-ext_token_login
+  PACKAGE_SUMMARY:      RWTH plugin for authenticating a user with an oauth access token.
+  PACKAGE_DESCRIPTION:  Package to install the Moodle Plugin ext_token_login.