Update README

.github/workflows/CI-CD.yml

@@ -3,7 +3,7 @@ name:  CI/CD
 on: [push]
 jobs:
   publish:
-    if: github.ref == 'refs/heads/master'
+    if: github.ref == 'refs/heads/master' || github.ref == 'refs/heads/staging'
     runs-on: ubuntu-latest
     steps:
       - name: Check out the repo

README.md

@@ -0,0 +1,23 @@
+## Postgres givethio
+
+We needed a postgres docker image with enabled pg_cron so we wrote and publish this docker image 
+to use it in https://github.com/Giveth/impact-graph
+
+### Usage
+We assumed that the **PGDATA** is `/var/lib/postgresql/data/pgdata` and the DB name is `givethio`, so if you want to use this image in 
+docker-compose you can use something like this
+
+```
+  givethio-postgres:
+    image: ghcr.io/giveth/postgres-givethio:latest
+    restart: always
+    environment:
+      - POSTGRES_DB=givethio
+      - POSTGRES_USER=yourDesiredUsername
+      - POSTGRES_PASSWORD=yourDesiredPassword
+      - PGDATA=/var/lib/postgresql/data/pgdata
+```
+
+
+
+