chore: Add docs on customizing email template content (#1141)

docs/customizations/email-notifications.md

@@ -0,0 +1,66 @@
+---
+path: "/docs/customizations/email-notifications"
+title: "Customize email notifications in Chatwoot"
+---
+
+Chatwoot allows customization of email notifications in self hosted installations.
+
+To customize the email notifications, follow the instructions below. Inorder to update the content, you have to add a new template in the Database, here is how you can do it.
+
+### 1. Login into the rails console.
+
+For Heroku installation, login to your account, go to the app. Click on "More", select "Run Console" from the dropdown menu. Enter the following command and hit run
+
+```rb
+heroku run rails console
+```
+
+For Linux VM installations, go to directory where Chatwoot code is available. If you have used the installation script, the default path is `/home/chatwoot/chatwoot`. Run the following command.
+
+```rb
+RAILS_ENV=production bundle exec rails console
+```
+
+### 2. Create a new template for the emails. Execute the following commands.
+
+```rb
+email_template = EmailTemplate.new
+email_template.name = 'conversation_assignment' # Accepts conversation_assignment, conversation_creation
+email_template.body = '// Enter your content'
+email_template.save!
+```
+
+#### Variables
+
+Template would receive 3 variable
+
+1. `user` - Use `{{ user.name }}` to get the username.
+2. `conversation` - Use `{{ conversation.display_id }}` to get the conversation ID
+3. `action_url` - This is the URL of the conversation.
+
+### Default content 
+
+Default content of the above template is as shown below
+
+#### 1. Conversation Assignment
+
+```html
+<p>Hi {{user.available_name}},</p>
+<p>Time to save the world. A new conversation has been assigned to you</p>
+<p> Click <a href="{{action_url}}">here</a> to get cracking.</p>
+```
+
+#### 2. Conversation Creation
+
+```html
+<p>Hi {{user.available_name}}</p>
+
+<p>Time to save the world. A new conversation has been created in {{ inbox.name }}</p>
+<p>
+Click <a href="{{ action_url }}">here</a> to get cracking.
+</p>
+```
+
+We use [Liquid templating engine](https://shopify.github.io/liquid/) internally, so all valid operators can be used here.
+
+