added npm readme

npm-packages/README.md

+# Include jobs from external YAML files
+
+You can include the jobs in this repository's YAML files as follows:
+
+```yml
+include:
+  - https://git.code.tecnalia.com/digicon-webxr-store/ci-files/-/raw/master/npm-packages/artifactory.yml
+  - https://git.code.tecnalia.com/digicon-webxr-store/ci-files/-/raw/master/npm-packages/build.yml
+  - https://git.code.tecnalia.com/digicon-webxr-store/ci-files/-/raw/master/npm-packages/pages.yml
+```
+
+## jobs
+
+### build
+
+Check if dependencies exists.
+
+### artifactory
+
+Publish the package to Artifactory.
+
+### pages
+
+Trys to run the build process, and creates a dist folder with the result. Allowing to display an static website.
+
+## Example
+
+An example of a valid .gitlab-ci.yml can be:
+
+```yml
+include:
+  - https://git.code.tecnalia.com/digicon-webxr-store/ci-files/-/raw/master/npm-packages/build.yml
+  - https://git.code.tecnalia.com/digicon-webxr-store/ci-files/-/raw/master/npm-packages/artifactory.yml
+
+stages:
+  - build
+  - deploy
+
+
+
+```

npm-packages/gitlab-ci.yml

-image: $ACR_URL/node:12
-before_script:
-  - npm -g config set user root
-  - npm install -g jfrog-cli-go
-cache:
-  paths:
-    - node_modules/
-job:
-  tags:
-    - docker
-  script:
-    - jfrog rt c import $ARTIFACTORY_CI_CONFIGURATION
-    - jfrog rt use TRIArtifact
-    - jfrog rt ping
-    - jfrog rt npm-install --build-name=$CI_PROJECT_NAME --build-number=$CI_JOB_ID
-    - jfrog rt npm-publish --build-name=$CI_PROJECT_NAME --build-number=$CI_JOB_ID
-    - jfrog rt bce $CI_PROJECT_NAME $CI_JOB_ID
-    - jfrog rt bp $CI_PROJECT_NAME $CI_JOB_ID
-  only:
-    - tags