Documentation enhancements (#73)

docs/threepids/notification/basic-handler.md

@@ -0,0 +1,37 @@
+# Basic Notification handler
+Basic notification handler which uses two components:
+- Content generator, to produce the notifications
+- Connectors to send the notification content
+
+This handler can be used with the 3PID types:
+- `email`
+- `msisdn` (Phone numbers)
+
+## Generators
+- [Template](template-generator.md)
+## Connectors
+- Email
+  - [SMTP](../medium/email/smtp-connector.md)
+- SMS
+  - [Twilio](../medium/msisdn/twilio-connector.md)
+
+## Configuration
+Enabled by default or with:
+```yaml
+notification.handler.email: 'raw'
+```
+
+**WARNING:** Will be consolidated soon, prone to breaking changes.  
+Structure and default values:
+```yaml
+threepid.medium:
+  email:
+    identity:
+      from: ''
+      name: ''
+    connector: 'smtp'
+    generator: 'template'
+  msisdn:
+    connector: 'twilio'
+    generator: 'template'
+```