Add CI pipeline

.gitlab-ci.yml

+stages:
+  - build
+  - deploy
+
+variables:
+  EXPORT_DIR: "/var/www/html/pages"
+  RELEASE_DIR: "$EXPORT_DIR/$CI_PROJECT_NAME/release_target_100"
+
+build-p2:
+  stage: build
+  tags: 
+    - docker # use shared runner
+  image: maven:3.6.3-adoptopenjdk-15
+  script:
+    - mvn --version
+    - mvn clean install
+  when: manual
+  artifacts:
+    paths:
+      - de.hft-stuttgart.cityunits.p2site/target/repository/
+    expire_in: 1 day
+     
+pages-master:
+  stage: deploy
+  dependencies:
+    - build-p2
+  tags: 
+    - production # use special CLI runner for publishing to $EXPORT_DIR
+  script:
+    - rm -rf "$RELEASE_DIR"
+    - mkdir -p "$RELEASE_DIR"
+    - cp -r de.hft-stuttgart.indriya.p2site/target/repository/* "$RELEASE_DIR"
+  only:
+    - master

Dockerfile

-FROM maven:3.6.3-adoptopenjdk-15
-WORKDIR /home/projects
-COPY ./ ./
-RUN mvn clean install

README.md

 # de.hft-stuttgart.cityunits
 
-Create Eclipse P2 repository with Ecore data types for units based on Indriya reference implementation. Provide special units for urban simulation.
+Create Eclipse P2 repository with Ecore data types for units based on Indriya reference implementation and some special units for urban simulation.
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+
+To add OSGi bundles published in this P2 repository add site [https://transfer.hft-stuttgart.de/pages/de.hft-stuttgart.cityunits/release_target_100/]() to a running Eclipse instance via `Eclipse -> Preferences -> Install/Update -> Available Software Sites -> Add...` or to a target platform definition via `Eclipse -> Preferences -> Plug-in Development -> Target Platform -> Edit...`.
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