Pocket ID instructions (#55)

* Update pocket-id.md

Updated Public client configuration for Pocket ID

* Update pocket-id.md

Fixed formatting

* Update pocket-id.md

Updated Home Assistant URL and fixed formatting even more.

* Update pocket-id.md

continue to fix formatting

* Update pocket-id.md

* Update pocket-id.md

Found the preview button :-) Hopefully last formatting commit.

* Update pocket-id.md

Added Confidential client configuration

* Update pocket-id.md

Fixed some formatting again

docs/provider-configurations/pocket-id.md

@@ -1,2 +1,58 @@
 # Pocket ID
-Under construction.
+
+## Public client configuration
+
+### Pocket ID configuration
+1. Login to Pocket ID and go to `OIDC Clients`
+
+2. Click on `Add OIDC Client`
+
+3. Fill the following details:
+    - Name: `Home Assistant`
+    - Callback URLs: `<your-homeassistant-url>/auth/oidc/callback` (for example: https://hass.example.com/auth/oidc/callback)
+    - Click on `Public Client` (PKCE will be automatically marked when doing this)
+      
+4. Click on `Save`
+
+5. Click on `Show more details` and note down your `Client ID` and `OIDC Discovery URL` since you will need them later.
+
+### Home Assistant configuration
+1. Add following configuration in Home Assistant's configuration.yaml:
+```yaml
+auth_oidc:
+  client_id: <The Client ID you have noted down> 
+  discovery_url: <The OIDC Discovery URL you have noted down> (for example: https://id.example.com/.well-known/openid-configuration)
+```
+
+2. Restart Home Assistant and go to your Home Assistant OIDC URL (for example: https://hass.example.com/auth/oidc/welcome)
+
+## Confidential client configuration
+
+### Pocket ID configuration
+1. Login to Pocket ID and go to `OIDC Clients`
+
+2. Click on `Add OIDC Client`
+
+3. Fill the following details:
+    - Name: `Home Assistant`
+    - Callback URLs: `<your-homeassistant-url>/auth/oidc/callback` (for example: https://hass.example.com/auth/oidc/callback)
+      
+4. Click on `Save`
+
+5. Click on `Show more details` and note down your:
+    - `Client ID`
+    - `Client secret`
+    - `OIDC Discovery URL`
+  
+### Home Assistant configuration
+1. Add following configuration in Home Assistant's configuration.yaml:
+```yaml
+auth_oidc:
+  client_id: <The Client ID you have noted down>
+  client_secret: <The Client secret you have noted down>
+  discovery_url: <The OIDC Discovery URL you have noted down> (for example: https://id.example.com/.well-known/openid-configuration)
+```
+
+2. Restart Home Assistant and go to your Home Assistant OIDC URL (for example: https://hass.example.com/auth/oidc/welcome)
+
+