Add .gitlab-ci.yml file

- On each push to master the git clone is updated on the LCR workstations.
- Update README and convert it to markdown

.gitlab-ci.yml

+stages:
+  - deploy
+
+deploy:
+  tags:
+    - docker
+  stage: deploy
+  image: registry.esss.lu.se/ics-docker/tower-cli:3.3
+  script:
+    - >
+      tower-cli job launch
+      -h torn.tn.esss.lu.se
+      -u ${ANSIBLE_AWX_USERNAME}
+      -p ${ANSIBLE_AWX_PASSWORD}
+      -J "deploy-cs-studio@lcr"
+      --tags csstudio-ess-opis
+      -e "csstudio_ess_opis_version=$CI_COMMIT_REF_NAME" --monitor
+  only:
+    - master

readme.txt → README.md

+# ESS CS-Studio OPIs
+
 This folder contains the validated and approved CS-Studio OPI files to be used at ESS to control the facility.
 
+## Structure
+
 Here the structure of this folder:
 
+```
 ess-opis/
 ├── -common-
 │   ├── devices
@@ -22,10 +27,12 @@ ess-opis/
     ├── neutron-instruments
     ├── personnel-safety-systems
     └── target-station
+```
 
 Each -common- folder should be used to contain OPIs common to that level. 
 The folder has the following structure:
 
+```
 -common-/
 ├── devices
 │   ├── beam-magnets-and-deflector
@@ -52,9 +59,11 @@ The folder has the following structure:
 │   ├── vacuum
 │   └── water-cooling
 └── utilities
+```
 
 Here the structure for the remaining folders in control-room and engineering:
 
+```
 accelerator/
 ├── accelerator-to-target
 ├── drift-tube-linac
@@ -135,4 +144,11 @@ target-station/
 ├── target-systems
 ├── ts-storage
 └── tune-up-dump
+```
+
+## Deployment
 
+The ess-opis repository is cloned and mounted in CS-Studio by the [Ansible role](https://gitlab.esss.lu.se/ics-ansible-galaxy/ics-ans-role-cs-studio)
+used to deploy CS-Studio.
+Every time a push is done on the master branch, it triggers an Ansible job via AWX API to update the git repository on the LCR workstations.
+Refer to the `.gitlab-ci.yml` file for the implementation.