Add PocketID Instruction manual

docs/features/packetid.md

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+---
+sidebar_position: 4
+title: PocketID OAuth
+---
+
+PocketID OAuth Allows you to log in to Remnawave Dashboard via the decentralized identification service PocketID.
+
+<div style={{ display: 'flex', justifyContent: 'center' }}>
+  <img src="/features/pocketid/pocketid-preview.png" alt="PocketID OAuth" width="800" style={{ borderRadius: '8px' }} />
+</div>
+
+---
+
+### Setting up
+
+1. Open Remnawave Panel and move to `Settings` -> `Telegram`.
+2. Click on `PocketID` tab.
+3. Enter:
+   - `PocketID Client ID`
+   - `PocketID Client Secret`
+   - `Plain Domain`, Your PocketID domain (pocketid.yourdomain.com).
+   - `Allowed Emails`, Enter your PocketID email.
+4. Click on `Save` button.
+
+---
+
+### Configuring PocketID
+
+1. Go to `Administration` > `OIDC Clients`
+2. Click on `Add OIDC Client` button.
+3. Enter:
+- `Client Launch URL`
+```bash
+https://panel.domain.com
+```
+- `Callback URLs`
+```bash
+https://panel.domain.com/oauth2/callback/pocketid
+```
+4. Save the settings.
+
+:::warning
+Do not turn on `Puclic cient` and `PKCE`
+:::
+
+After that, a PocketID login button will appear in Remnawave.