Add notification platform setup guides to README

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README.md

@@ -144,7 +144,82 @@ To receive alerts via Telegram, you need to create a bot and get your chat ID.
 
 ---
 
-*Guides for Discord, Slack, and Email coming soon.*
+### Discord
+
+To receive alerts in a Discord channel, you need to create a webhook.
+
+#### 1. Create a Discord Webhook
+
+1. Open **Discord** and navigate to the server where you want to receive alerts.
+2. Go to the channel you want alerts posted in (or create a new one, e.g. `#koin-alerts`).
+3. Click the **gear icon** next to the channel name to open **Channel Settings**.
+4. Go to **Integrations** > **Webhooks**.
+5. Click **New Webhook**.
+6. Give it a name (e.g. `Koin Ping`) and click **Copy Webhook URL**.
+
+   The URL will look like: `https://discord.com/api/webhooks/123456789/AbCdEfGhIjKl...`
+
+#### 2. Save in Koin Ping
+
+1. Go to the **Alerts** page in Koin Ping.
+2. In the **Notification Settings** panel, find the **Discord** section.
+3. Paste your **Webhook URL** into the field.
+4. Click **Save Settings**.
+5. Click **Test All Channels** to verify — you should see a test message appear in your Discord channel.
+
+---
+
+### Slack
+
+To receive alerts in a Slack channel, you need to create an Incoming Webhook.
+
+#### 1. Create a Slack App with Incoming Webhooks
+
+1. Go to [https://api.slack.com/apps](https://api.slack.com/apps) and click **Create New App**.
+2. Choose **From scratch**, give it a name (e.g. `Koin Ping`), and select your workspace.
+3. In the app settings, go to **Incoming Webhooks** in the left sidebar.
+4. Toggle **Activate Incoming Webhooks** to **On**.
+5. Click **Add New Webhook to Workspace**.
+6. Select the channel where you want alerts posted (e.g. `#koin-alerts`) and click **Allow**.
+7. Copy the **Webhook URL** — it will start with `https://hooks.slack.com/services/...`
+
+#### 2. Save in Koin Ping
+
+1. Go to the **Alerts** page in Koin Ping.
+2. In the **Notification Settings** panel, find the **Slack** section.
+3. Paste your **Webhook URL** into the field.
+4. Click **Save Settings**.
+5. Click **Test All Channels** to verify — you should see a test message appear in your Slack channel.
+
+---
+
+### Email
+
+Koin Ping sends email alerts and digests via [Resend](https://resend.com). To enable email notifications, the application owner must configure a Resend account and verified sending domain.
+
+#### For Application Owners (Deployment Setup)
+
+1. Create an account at [resend.com](https://resend.com).
+2. Go to [resend.com/domains](https://resend.com/domains) and add your sending domain.
+3. Add the DNS records Resend provides (SPF, DKIM, etc.) to your domain's DNS settings.
+4. Once verified, create an API key at [resend.com/api-keys](https://resend.com/api-keys).
+5. Set the following in your `.env` file:
+
+   ```
+   RESEND_API_KEY=re_your_api_key_here
+   EMAIL_FROM=Your App <alerts@yourdomain.com>
+   ```
+
+6. Restart the API server and poller to pick up the changes.
+
+#### For Users
+
+1. Go to the **Alerts** page in Koin Ping.
+2. In the **Notification Settings** panel, find the **Email** section.
+3. Enter the email address where you want to receive alerts.
+4. Click **Save Settings**.
+5. Click **Verify Email** to receive a confirmation message.
+6. Click **Test All Channels** to verify — you should receive a test alert at your email address.
 
 ## License