documentation in README: howto postgres, lists manage and user management

added documentation in the readme, howto postgres, lists manage and user management

README.md

@@ -1,10 +1,7 @@
-<a href="https://zerodha.tech"><img src="https://zerodha.tech/static/images/github-badge.svg" align="right" /></a>
-
-![listmonk](https://user-images.githubusercontent.com/547147/89733021-43fbf700-da70-11ea-82e4-e98cb5010257.png)
 
 listmonk is a standalone, self-hosted, newsletter and mailing list manager. It is fast, feature-rich, and packed into a single binary. It uses a PostgreSQL database as its data store.
 
-[![listmonk-dashboard](https://user-images.githubusercontent.com/547147/89733057-87566580-da70-11ea-8160-855f6f046a55.png)](https://listmonk.app)
+
 Visit [listmonk.app](https://listmonk.app)
 
 ## Installation
@@ -86,18 +83,77 @@ oncen checked it works, stop the process.
 - change ownership of the files to `www-data` or whatever user you have assigned the webserver `chown -R www-data:www-data listmonk`
 - `./listmonk --upgrade` to upgrade an existing DB. (Upgrades are idempotent and running them multiple times have no side effects).
 - start again the binary or the service `sudo systemctl start listmonk.service`
+
+__________________
+
+## Postgres
+
+### connect to db
+```bash
+su postres -
+```
+as user `postgres` execute
+```bash
+psql
+```
+inside postgres use these commands
+
+ - `\l` to list databases
+ - `\c <databasename>` to use a database
+ - `\dt` to list relations/tables
+
+### See the lists
+
+```postgres
+SELECT * from lists;
+```
+will show something like
+
+```postgres
+id |                 uuid                 |                            name                            |  type   | optin  |  tags  |          created_at           |          updated_at           
+----+--------------------------------------+------------------------------------------------------------+---------+--------+--------+-------------------------------+-------------------------------
+  1 | xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx | Lista de prueba                                            | private | single | {test} | 2021-05-19 15:33:08.503002+02 | 2021-05-27 12:05:28.201633+02
+  3 | xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx | Agendas                                                    | public  | single |        | 2021-06-03 17:18:58.398437+02 | 2021-06-03 17:42:13.446523+02
+  4 | xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx | Prensa                                                     | public  | single |        | 2021-06-03 17:19:11.233554+02 | 2021-07-13 18:04:58.078138+02
+  5 | xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx | Instituciones, Festivales, etc | public  | single |        | 2021-06-03 17:19:38.707663+02 | 2021-07-13 18:41:34.764095+02
+  6 | xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx | Newsletter                                                 | public  | single |        | 2021-06-03 17:19:51.514315+02 | 2021-07-13 18:44:15.855554+02
+  7 | xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx | Antiguas socias y colaboradoras                            | public  | single |        | 2021-06-03 17:20:15.807685+02 | 2021-07-13 18:47:55.651608+02
+(6 rows)
+
+```
+
+### Manage subscribers list
+once connected to database with `\c <databasename>` and promt changes to `<databasename>=#`
+
+select all users from subscribers lists
+```postgres
+SELECT * subscriber_lists;
+```
+will show something like this
+```postgres
+ subscriber_id | list_id |   status    |          created_at           |          updated_at           
+---------------+---------+-------------+-------------------------------+-------------------------------
+           646 |       7 | confirmed   | 2021-07-13 18:47:55.616239+02 | 2021-07-13 18:47:55.616239+02
+            45 |       4 | confirmed   | 2021-07-13 18:04:57.974174+02 | 2021-07-13 18:04:57.974174+02
+             9 |       3 | confirmed   | 2021-06-03 17:34:34.714387+02 | 2021-06-03 17:42:13.431435+02
+          3148 |       7 | confirmed   | 2021-07-13 18:47:55.616239+02 | 2021-07-13 18:47:55.616239+02
+             7 |       7 | unconfirmed | 2021-06-08 17:17:26.372759+02 | 2021-06-08 17:17:26.372759+02
+          1232 |       7 | confirmed   | 2021-07-13 18:47:55.616239+02 | 2021-07-13 18:47:55.616239+02
+             7 |       5 | confirmed   | 2021-06-08 17:17:26.372759+02 | 2021-06-08 17:17:26.372759+02
+```
+
+#### confirm users
+modify the status from `unconfirmed` to `confirmed`
+
+```postgres
+UPDATE subscriber_lists SET status='confirmed' WHERE list_id=<number>;
+```
+change the `<number>` for the one you see under `list_id`
 __________________
 
 ### Heroku 
 
-Using the [Nginx buildpack](https://github.com/heroku/heroku-buildpack-nginx) can be used to deploy listmonk on Heroku and use Nginx as a proxy to setup basicauth. 
+Using the [Nginx buildpack](https://github.com/heroku/heroku-buildpack-nginx) can be used to deploy listmonk on Heroku and use Nginx as a proxy to setup basicauth.  [Heroku deploy button](https://github.com/bumi/listmonk-heroku) provides an automated default deployment.
-This one-click [Heroku deploy button](https://github.com/bumi/listmonk-heroku) provides an automated default deployment.
-
-[![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy?template=https://github.com/bumi/listmonk-heroku)
-
-Please note that [configuration options](https://listmonk.app/docs/configuration) must be set using [environment configuration variables](https://devcenter.heroku.com/articles/config-vars).
-
-
 
 ## Developers
 listmonk is a free and open source software licensed under AGPLv3. If you are interested in contributing, refer to the [developer setup](https://listmonk.app/docs/developer-setup). The backend is written in Go and the frontend is Vue with Buefy for UI.