✨ Add Send Email node docs

docs/nodes/nodes-library/core-nodes/SendEmail/README.md

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+---
+permalink: /nodes/n8n-nodes-base.emailSend
+---
+
+# Send Email
+
+The Send Email node is used to send an email via an SMTP email server.
+
+::: tip 🔑 Credential
+You can find authentication information for this node [here](../../../credentials/SendEmail/README.md).
+:::
+
+::: tip 💡 Keep in mind
+1. Before sending, ensure that you have already created email addresses that are approved for sending on your SMTP service.
+2. The Send Email node merely sends an email via your SMTP server and plays no part in email deliverability.
+3. To attach a file, you will need to use an additional node such as the [Read Binary File](../../core-nodes/ReadBinaryFile/README.md) node or the [HTTP Request](../../core-nodes/HTTPRequest/README.md) node to pass a file as a data property.
+:::
+
+## Basic Operations
+
+- Send an email
+
+## Node Reference
+
+- **From Email:** The email address you are sending from.
+- **To Email:** The recipient email address.
+- **CC Email:** A field that can be used to specify an email address for a carbon copy of the email.
+- **BCC Email:** A field that can be used to specify an email address for a blind carbon copy of the email.
+- **Subject:** The subject of your message.
+- **Text:** Your message, in plaintext.
+- **HTML:** Your message, in HTML.
+- **Attachments:** A field that can be used to attach any attachments as data properties.
+
+## Example Usage
+
+This workflow allows you to send an email using the Send Email node. You can also find the [workflow](https://n8n.io/workflows/584) on the website. This example usage workflow would use the following two nodes.
+- [Start](../../core-nodes/Start/README.md)
+- [Send Email]()
+
+The final workflow should look like the following image.
+
+![A workflow with the Send Email node](./workflow.png)
+
+### 1. Start node
+
+The start node exists by default when you create a new workflow.
+
+### 2. Send Email node
+
+1. First of all, you'll have to enter credentials for the Send Email node. You can find out how to do that [here](../../../credentials/SendEmail/README.md).
+2. Enter the email address you want to send from in the *From Email* field.
+3. Enter the recipient email address in the *To Email* field.
+4. Enter a subject for your message in the *Subject* field.
+5. Enter your message in the *Text* field.
+6. Click on *Execute Node* to run the workflow.