refactor: sql/OIDC WIP README

Author: simonredfern

obp-api/src/main/scripts/sql/OIDC/README.md

@@ -0,0 +1,56 @@
+# Prerequisites
+
+For those of us that don't use postgres every day:
+
+1. You will need to have access to a postgres user that can create roles and views etc.
+2. You will probably want that postgres user to have easy access to your file system so you can run this script and tweak it if need be.
+
+That means.
+
+1. You probably want to have a postgres user with the same name as your linux or mac username.
+
+So:
+
+```bash
+sudo -u postgres psql
+```
+
+```sql
+CREATE ROLE <YOURLINUXUSERNAME> WITH LOGIN SUPERUSER CREATEDB CREATEROLE;
+```
+
+This step is not required but
+
+```sql
+CREATE DATABASE <YOURLINUXUSERNAME> OWNER <YOURLINUXUSERNAME>;
+```
+
+now quit with `\q`
+
+now when you:
+
+```bash
+psql
+```
+
+you will be logged in and have access to your normal home directory.
+
+now connect to the OBP database you want e.g.:
+
+```sql
+\c sandbox
+```
+
+now run the script from within the psql shell:
+
+```sql
+\i ~/Documents/workspace_2024/OBP-API-C/OBP-API/obp-api/src/main/scripts/sql/create_oidc_user_and_views.sql
+```
+
+or run it from the linux terminal specifying the database
+
+```bash
+psql -d sandbox -f ~/Documents/workspace_2024/OBP-API-C/OBP-API/obp-api/src/main/scripts/sql/create_oidc_user_and_views.sql
+```
+
+either way, check the output of the script carefully.