Add a process file

Adapt README and Gitlab CI accordingly

.gitlab-ci.yml

@@ -26,7 +26,7 @@ deploy preprod:
                 - rm -rf node_modules/
                 - npm install
                 - cp config.json.default config.json
-                - sudo /usr/bin/pm2 restart slogan
+                - sudo /usr/bin/pm2 startOrRestart slogan.app.yml
                 - sudo /usr/bin/pm2 show slogan
         only:
                 - preprod
@@ -42,7 +42,7 @@ deploy prod:
                 - rm -rf node_modules/
                 - npm install --production
                 - cp config.json.default config.json
-                - sudo /usr/bin/pm2 restart slogan
+                - sudo /usr/bin/pm2 startOrRestart slogan.app.yml
                 - sudo /usr/bin/pm2 show slogan
         only:
                 - master

README.md

@@ -22,5 +22,5 @@ npm install
 
 We're suggesting the use of pm2 to manage the service
 ```sh
-pm2 start srv.sh --name slogan --watch
+pm2 start slogan.app.yml
 ```

slogan.app.yml

+apps:
+  - script: ./srv.js
+    name: slogan
+    watch: true